London Subway Attack: U.K. police make second arrest

LONDON — British authorities have arrested a second man in connection with the rush hour attack that injured 30 in a packed London subway station last week, the Metropolitan Police Service said Sunday.

The 21-year-old was arrested in Hounslow in West London just before midnight Saturday, police said in a statement.

On Saturday, the Met announced it had detained an 18-year-old near the Port of Dover — a key ferry terminal between Britain and France — calling it a "significant" arrest.

"At this stage we're keeping an open mind around whether more than one person is responsible for the attack," Neil Basu, the senior national coordinator for counterterrorism policing, told reporters.

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An injured woman reacts outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
LONDON, ENGLAND - SEPTEMBER 15: A police officer escorts an injured woman from the scene at Parsons Green Underground Station on September 15, 2017 in London, England. Several people have been injured after an explosion on a tube train in south-west London. The Police are treating the incident as terrorism. (Photo by Chris J Ratcliffe/Getty Images)
LONDON, ENGLAND - SEPTEMBER 15: A police officer escorts an injured woman from the scene at Parsons Green Underground Station on September 15, 2017 in London, England. Several people have been injured after an explosion on a tube train in south-west London. The Police are treating the incident and terrorism. (Photo by Chris J Ratcliffe/Getty Images)
Armed police officers walk through a carriage of a London underground tube train at Parsons Green station in London, Britain September 15, 2017. REUTERS/Hannah McKay
A woman reacts outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
A man sits and waits in a London underground tube train at Parsons Green station in London, Britain September 15, 2017. REUTERS/Hannah McKay
A woman reacts outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Police officers walk on the road near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
An injured woman is led away after an incident at Parsons Green underground station in London, Britain, September 15, 2017. REUTERS/Luke MacGregor
People react near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Police officers and sniffer dogs walk near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Police officers stand on the road near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Police officers escort members of the public out of their inner cordon as they work near Parsons Green underground tube station in west London on September 15, 2017, following an incident on an underground tube carriage at the station. Police and ambulance services said they were responding to an 'incident' at Parsons Green underground station in west London on Friday, following media reports of an explosion. A Metro.co.uk reporter at the scene was quoted by the paper as saying that a white container exploded on the train and passengers had suffered facial burns. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
A woman walks with her dog past police cordon near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Armed policemen stand outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Police officers escort members of the public out of their inner cordon as they work near Parsons Green underground tube station in west London on September 15, 2017, following an incident on an underground tube carriage at the station. Police and ambulance services said they were responding to an 'incident' at Parsons Green underground station in west London on Friday, following media reports of an explosion. A Metro.co.uk reporter at the scene was quoted by the paper as saying that a white container exploded on the train and passengers had suffered facial burns. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Members of the London Fire Brigade stand by cordon near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
People stand by an ambulance near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Police vehicles line the street near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Members of a bomb disposal squad stand in the street near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
People speak with a police officer outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Armed policemen stand by cordon near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
LONDON, ENGLAND - SEPTEMBER 15: The emergency services are seen near the police cordon at Parsons Green Underground Station on September 15, 2017 in London, England. Emergency services are investigating reports of an explosion at the West London tube station. (Photo by Chris J Ratcliffe/Getty Images)
An injured woman is led away after an incident at Parsons Green underground station in London, Britain, September 15, 2017. REUTERS/Luke MacGregor
Staff from a local Italian restaurant hands out pizza and water from a stall near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Deputy Chief Constable Adrian Hanstock of the British Transport Police makes a statement to the media after an incident at Parsons Green underground station in London, Britain, September 15, 2017. REUTERS/Luke MacGregor
LONDON, ENGLAND - SEPTEMBER 15: A forensic tent is seen next to the stopped tube train at Parsons Green Underground Station on September 15, 2017 in London, England. Several people have been injured after an explosion on a tube train in south-west London. The Police are treating the incident as terrorism. (Photo by Chris J Ratcliffe/Getty Images)
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Also on Saturday, officials raided a property in the county of Surrey outside London, and evacuated a residential address and surrounding homes. A search of the address remained ongoing as a precautionary measure, and there were no immediate reports of other arrests.

After the detonation on a packed subway car at Parsons Green Tube station in southwest London, Prime Minister Theresa May announced that the nation's threat level for international terrorism had been increased to critical, its highest level, meaning another terror attack may be imminent.

Hundreds of soldiers have been deployed at strategic sites around the city to free up police to hunt those behind the incident — the latest in a series of attacks in the country's capital.

Photos of the incident shared on social media showed a bucket on fire in the subway car, with wires apparently protruding from the plastic bag the container had been carried in.

ISIS made its customary claim of responsibility for the attack, without providing any supporting evidence.

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