Police hold two after car with gas cylinders found in Paris

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PARIS, Sept 7 (Reuters) - A car, whose owner is on an intelligence services watchlist of people suspected of religious radicalisation, was discovered near Notre-Dame cathedral in Paris on Saturday night with seven gas cylinders inside, police and judicial officials said on Wednesday.

The car owner was taken into custody but later released, one judicial official said. A couple, aged 34 and 29, were arrested at a motorway lay-by on Tuesday in southern France in connection with the incident and remained in custody, the official said.

The Peugeot 607, which had no registration plates, contained seven gas cylinders, one of them empty on the front passenger seat, two police officials said.

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It was found with its hazard lights flashing, as if to attract attention, they said.

Interior Minister Bernard Cazeneuve said he was waiting for a report from investigators on what the possible motives were for the incident.

There was no detonating device present in the car, found on a Seine riverside stretch called the Quai de Montebello, meters from the Notre-Dame cathedral, one of Paris's many popular tourist attractions.

Documents with writing in Arabic were also found in the car.

More than 200 people have been killed in terror attacks over the past year-and-a-half in France.

France remains on maximum alert after calls by the Islamic State group for followers to attack the country, which is bombing the militant group's bases in Iraq and Syria.

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Brussels police raid, Paris attacker
Forensic police investigate outside the building where was carried out a police operation in the Molenbeek-Saint-Jean district in Brussels, on March 18, 2016, as part of the investigation into the Paris November attacks. The main suspect in the jihadist attacks on Paris in November, Salah Abdeslam, was arrested in a raid in Brussels on March 18, French police sources said. / AFP / BELGA / DIRK WAEM / Belgium OUT (Photo credit should read DIRK WAEM/AFP/Getty Images)
Forensic police investigate outside the building where was carried out a police operation in the Molenbeek-Saint-Jean district in Brussels, on March 18, 2016, as part of the investigation into the Paris November attacks. The main suspect in the jihadist attacks on Paris in November, Salah Abdeslam, was arrested in a raid in Brussels on March 18, French police sources said. / AFP / BELGA / DIRK WAEM / Belgium OUT (Photo credit should read DIRK WAEM/AFP/Getty Images)
Forensic police investigate outside the building where was carried out a police operation in the Molenbeek-Saint-Jean district in Brussels, on March 18, 2016, as part of the investigation into the Paris November attacks. The main suspect in the jihadist attacks on Paris in November, Salah Abdeslam, was arrested in a raid in Brussels on March 18, French police sources said. / AFP / BELGA / DIRK WAEM / Belgium OUT (Photo credit should read DIRK WAEM/AFP/Getty Images)
A picture shows damage on the building where was carried out a police operation in the Molenbeek-Saint-Jean district in Brussels, on March 18, 2016, as part of the investigation into the Paris November attacks. The main suspect in the jihadist attacks on Paris in November, Salah Abdeslam, was arrested in a raid in Brussels on March 18, French police sources said. / AFP / BELGA / DIRK WAEM / Belgium OUT (Photo credit should read DIRK WAEM/AFP/Getty Images)
SINT-JANS-MOLENBEEK, BELGIUM - MARCH 18: Police officers guard a road after raids in which several people, including Paris attacks suspect Salah Abdeslam, were arrested on March 18, 2016 in Sint-Jans-Molenbeek, Belgium. Belgian police arrested three people in raids including key Paris attacks suspect Salah Abdeslam according to Belgian Prime Minister Charles Michel. (Photo by Carl Court/Getty Images)
SINT-JANS-MOLENBEEK, BELGIUM - MARCH 18: Police officers guard a road after raids in which several people, including Paris attacks suspect Salah Abdeslam, were arrested on March 18, 2016 in Sint-Jans-Molenbeek, Belgium. Belgian police arrested three people in raids including key Paris attacks suspect Salah Abdeslam according to Belgian Prime Minister Charles Michel. (Photo by Carl Court/Getty Images)
SINT-JANS-MOLENBEEK, BELGIUM - MARCH 18: Police officers guard a road after raids in which several people, including Paris attacks suspect Salah Abdeslam, were arrested on March 18, 2016 in Sint-Jans-Molenbeek, Belgium. Belgian police arrested three people in raids including key Paris attacks suspect Salah Abdeslam according to Belgian Prime Minister Charles Michel. (Photo by Carl Court/Getty Images)
SINT-JANS-MOLENBEEK, BELGIUM - MARCH 18: Police officers patrol after raids in which several people, including Paris attacks suspect Salah Abdeslam, were arrested on March 18, 2016 in Sint-Jans-Molenbeek, Belgium. Belgian police arrested three people in raids including key Paris attacks suspect Salah Abdeslam according to Belgian Prime Minister Charles Michel. (Photo by Carl Court/Getty Images)
SINT-JANS-MOLENBEEK, BELGIUM - MARCH 18: Police officers guard a road after raids in which several people, including Paris attacks suspect Salah Abdeslam, were arrested on March 18, 2016 in Sint-Jans-Molenbeek, Belgium. Belgian police arrested three people in raids including key Paris attacks suspect Salah Abdeslam according to Belgian Prime Minister Charles Michel. (Photo by Carl Court/Getty Images)
An ambulance passes next to a police officer with a dog during a police operation in the Molenbeek-Saint-Jean district in Brussels, on March 18, 2016, as part of the investigation into the Paris November attacks. The main suspect in the jihadist attacks on Paris in November, Salah Abdeslam, was arrested in a raid in Brussels on March 18, French police sources said. / AFP / BELGA / DIRK WAEM / Belgium OUT (Photo credit should read DIRK WAEM/AFP/Getty Images)
SINT-JANS-MOLENBEEK, BELGIUM - MARCH 18: Police officers guard a road after raids in which several people, including Paris attacks suspect Salah Abdeslam, were arrested on March 18, 2016 in Sint-Jans-Molenbeek, Belgium. Belgian police arrested three people in raids including key Paris attacks suspect Salah Abdeslam according to Belgian Prime Minister Charles Michel. (Photo by Carl Court/Getty Images)
A Belgian policeman stands guard in a street during a police action in the Molenbeek-Saint-Jean district in Brussels, on March 18, 2016. A police operation was underway on March 18, in the Brussels area home to key Paris attacks suspect Salah Abdeslam whose fingerprints were found in an apartment raided this week, the federal prosecutor's office said. AFP PHOTO / JOHN THYS / AFP / JOHN THYS (Photo credit should read JOHN THYS/AFP/Getty Images)
Police stand guard near the scene of a police operation in the Molenbeek-Saint-Jean district in Brussels, on March 18, 2016, as part of the investigation into the Paris November attacks. The main suspect in the jihadist attacks on Paris in November, Salah Abdeslam, was arrested in a raid in Brussels on March 18, French police sources said. / AFP / BELGA / AURORE BELOT / Belgium OUT (Photo credit should read AURORE BELOT/AFP/Getty Images)
A woman climbs into a police truck near the scene of a police operation in the Molenbeek-Saint-Jean district in Brussels, on March 18, 2016, as part of the investigation into the Paris November attacks. The main suspect in the jihadist attacks on Paris in November, Salah Abdeslam, was arrested in a raid in Brussels on March 18, French police sources said. / AFP / BELGA / AURORE BELOT / Belgium OUT (Photo credit should read AURORE BELOT/AFP/Getty Images)
Police stand guard near the scene of a police operation in the Molenbeek-Saint-Jean district in Brussels, on March 18, 2016, as part of the investigation into the Paris November attacks. The main suspect in the jihadist attacks on Paris in November, Salah Abdeslam, was arrested in a raid in Brussels on March 18, French police sources said. / AFP / BELGA / AURORE BELOT / Belgium OUT (Photo credit should read AURORE BELOT/AFP/Getty Images)
A policeman stands guard near the scene of a police operation in the Molenbeek-Saint-Jean district in Brussels, on March 18, 2016, as part of the investigation into the Paris November attacks. The main suspect in the jihadist attacks on Paris in November, Salah Abdeslam, was arrested in a raid in Brussels on March 18, French police sources said. / AFP / BELGA / AURORE BELOT / Belgium OUT (Photo credit should read AURORE BELOT/AFP/Getty Images)
Police speaks together near the scene of a police operation in the Molenbeek-Saint-Jean district in Brussels, on March 18, 2016, as part of the investigation into the Paris November attacks. The main suspect in the jihadist attacks on Paris in November, Salah Abdeslam, was arrested in a raid in Brussels on March 18, French police sources said. / AFP / BELGA / AURORE BELOT / Belgium OUT (Photo credit should read AURORE BELOT/AFP/Getty Images)
In this framegrab taken from VTM, armed police officers escort a suspect to a police vehicle during a raid in the Molenbeek neighborhood of Brussels, Belgium, Friday March 18, 2016. After an intense four-month manhunt across Europe and beyond, police on Friday captured Salah Abdeslam, the top fugitive in the Paris attacks in the same Brussels neighborhood where he grew up. (VTM via AP) BELGIUM OUT
Police officers with dogs during a raid in the Molenbeek neighborhood of Brussels, Belgium, Friday March 18, 2016. After an intense four-month manhunt across Europe and beyond, police on Friday captured Salah Abdeslam, the top fugitive in the Paris attacks in the same Brussels neighborhood where he grew up. (AP Photo/Geert Vanden Wijngaert)
Police evacuate a woman and a small child during a police raid in the Molenbeek neighbourhood of Brussels, Belgium on Friday, March 18, 2016. Two French police officials have told The Associated Press that Salah Abdeslam, the main fugitive from Islamic extremist attacks in Paris in November, has been arrested in Belgium's capital after four months at large. He was arrested Friday in a major police operation in the Brussels neighborhood of Molenbeek. (AP Photo/Geoffrey Van der Hasselt)
A policeman stands guards near the scene of a police operation in the Molenbeek-Saint-Jean district in Brussels, on March 18, 2016, as part of the investigation into the Paris November attacks. The main suspect in the jihadist attacks on Paris in November, Salah Abdeslam, was arrested in a raid in Brussels on March 18, French police sources said. / AFP / BELGA / Aurore BELOT / Belgium OUT (Photo credit should read AURORE BELOT/AFP/Getty Images)
Special operations police secure an area during a police raid in the Molenbeek neighbourhood of Brussels, Belgium on Friday, March 18, 2016. Two French police officials have told The Associated Press that Salah Abdeslam, the main fugitive from Islamic extremist attacks in Paris in November, has been arrested in Belgium's capital after four months at large. He was arrested Friday in a major police operation in the Brussels neighborhood of Molenbeek. (AP Photo/Geoffrey Van der Hasselt)
Police officers guard an entrance of a school during a raid in the Molenbeek neighborhood of Brussels, Belgium, Friday March 18, 2016. Police have descended in force to search a residence in the Molenbeek, and Belgian media reported gunshots had been fired. RTBF French-language TV reported late Friday afternoon that two people had been wounded, and that one might be Paris attacks fugitive Salah Abdeslam. (AP Photo/Geert Vanden Wijngaert)
Police officers guard an entrance of a school during a raid in the Molenbeek neighborhood of Brussels, Belgium, Friday March 18, 2016. Police have descended in force to search a residence in the Molenbeek, and Belgian media reported gunshots had been fired. RTBF French-language TV reported late Friday afternoon that two people had been wounded, and that one might be Paris attacks fugitive Salah Abdeslam. (AP Photo/Geert Vanden Wijngaert)
Emergency vehicles travel along a street blocked by armed police officers during a raid in the Molenbeek neighborhood of Brussels, Belgium, Friday March 18, 2016. Police have descended in force to search a residence in the Molenbeek, and Belgian media reported gunshots had been fired. RTBF French-language TV reported late Friday afternoon that two people had been wounded, and that one might be Paris attacks fugitive Salah Abdeslam. (Aaron Hamerlynck via AP)
A street is blocked by armed police officers during a raid in the Molenbeek neighborhood of Brussels, Belgium, Friday March 18, 2016. Police have descended in force to search a residence in the Molenbeek, and Belgian media reported gunshots had been fired. RTBF French-language TV reported late Friday afternoon that two people had been wounded, and that one might be Paris attacks fugitive Salah Abdeslam. (Aaron Hamerlynck via AP)
This framegrab taken from APTN shows an armed police officer during a raid in the Molenbeek neighborhood of Brussels, Belgium, Friday March 18, 2016. Police have descended in force to search a residence in the Molenbeek, and Belgian media reported gunshots had been fired. RTBF French-language TV reported late Friday afternoon that two people had been wounded, and that one might be Paris attacks fugitive Salah Abdeslam. (APTN via AP)
Belgian policemen stand guard in a road during a police action in the Molenbeek-Saint-Jean district in Brussels, on March 18, 2016. A police operation was underway on March 18, in the Brussels area home to key Paris attacks suspect Salah Abdeslam whose fingerprints were found in an apartment raided this week, the federal prosecutor's office said. / AFP / JOHN THYS (Photo credit should read JOHN THYS/AFP/Getty Images)
This framegrab taken from APTN shows armed police officers during a raid in the Molenbeek neighborhood of Brussels, Belgium, Friday March 18, 2016. Police have descended in force to search a residence in the Molenbeek, and Belgian media reported gunshots had been fired. RTBF French-language TV reported late Friday afternoon that two people had been wounded, and that one might be Paris attacks fugitive Salah Abdeslam. (APTN via AP)
This framegrab taken from APTN shows an emergency vehicle during a raid in the Molenbeek neighborhood of Brussels, Belgium, Friday March 18, 2016. Police have descended in force to search a residence in the Molenbeek, and Belgian media reported gunshots had been fired. RTBF French-language TV reported late Friday afternoon that two people had been wounded, and that one might be Paris attacks fugitive Salah Abdeslam. (APTN via AP)
A police officer guides two women away during a raid in the Molenbeek neighborhood of Brussels, Belgium, Friday March 18, 2016. Police have descended in force to search a residence in the Molenbeek, and Belgian media reported gunshots had been fired. RTBF French-language TV reported late Friday afternoon that two people had been wounded, and that one might be Paris attacks fugitive Salah Abdeslam. (AP Photo/Geert Vanden Wijngaert)
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Florence Berthout, mayor of Paris's Fifth Arrondissement (District), said the incident highlighted the need to beef up security and put more police on patrol in one of the world's most visited cities.

She said the vehicle was left in a zone where parking is strictly prohibited and that it had remained there for around two hours before it came to the attention of police.

"Police and army staffing must be stepped up," she told news TV channel BFM.

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Thousands of extra police and soldiers have been deployed to patrol sensitive sites across France since 130 people were killed by Islamist gunmen and suicide bombers in multiple attacks on Paris last Nov 13.

A state of emergency declared at that time is still in place and gives police extra search and arrest powers but debate still rages over security levels, following a further attack on July 14 in which a man mowed into crowds in the city of Nice, killing 86.

(Reporting by Emmanuel Jarry, Simon Carraud and Brian Love; Writing by Brian Love; Editing by Ingrid Melander and Richard Balmforth)

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