70 Paris airport workers were stripped of security clearances due to 'worrying behavior' prior to the EgyptAir crash

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Airport security in the wake of EgyptAir crash

It is still not known what caused the crash of EgyptAir flight MS804, which disappeared over the Mediterranean last week, taking with it all 66 people aboard.

No theory has yet been ruled out.

But because terrorists have targeted passenger jets before, French security officials at Roissy/Charles de Gaulle airport in Paris — where the flight originated — are looking at security camera footage of workers at the airport before the plane took off.

Charles de Gaulle has had problems with workers in the past, stripping about 70 people of their security clearances after the November 2015 attacks in Paris, according to The Guardian.

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70 Paris airport workers were stripped of security clearances due to 'worrying behavior' prior to the EgyptAir crash
PARIS, FRANCE - MARCH 22: (FRANCE OUT) French police officers patrol at the Trocadero Plaza next to the Eiffel Tower on March 22, 2106 in Paris, France. Since this morning 400 policemen and gendarmes have been deployed to increase the security in airports, stations and public transportation around Paris and its region after the terrorist attacks in Brussels today. (Photo by Christophe Morin/IP3/Getty Images)
German police officers guard a terminal of the airport in Frankfurt, Germany, Tuesday, March 22, 2016, when various explosions hit the Belgian capital Brussels killing several people. (AP Photo/Michael Probst)
An Israeli airport security guard patrols with a dog in Ben Gurion airport near Tel Aviv, Israel, Tuesday, March 22, 2016. After the Brussels attacks, Israel briefly announced that all Israeli flights from Europe were canceled, then reinstated the flights, Israel Airports Authority spokesman Ofer Leffler said. Pini Schiff, former director of security at Ben-Gurion Airport, said the attack in the Brussels airport was âa colossal failureâ of Belgian security, and he said âthe chances are very lowâ that such a bombing could take place in Israelâs airport. Israel's Ben-Gurion Airport is considered among the most secure in the world, an outcome stemming from several Palestinian attacks on Israeli planes and travelers in the 1970s. (AP Photo/Ariel Schalit)
A police officer guards a terminal of the airport during tighter security measures in Barcelona, Spain, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. (AP Photo/Emilio Morenatti)
Travelers wait at the counter of Brussels airlines in Ben Gurion airport near Tel Aviv, Israel, Tuesday, March 22, 2016. After the Brussels attacks, Israel briefly announced that all Israeli flights from Europe were canceled, then reinstated the flights, Israel Airports Authority spokesman Ofer Leffler said. Pini Schiff, former director of security at Ben-Gurion Airport, said the attack in the Brussels airport was âa colossal failureâ of Belgian security, and he said âthe chances are very lowâ that such a bombing could take place in Israelâs airport. Israel's Ben-Gurion Airport is considered among the most secure in the world, an outcome stemming from several Palestinian attacks on Israeli planes and travelers in the 1970s. (AP Photo/Ariel Schalit)
An Israeli airport security guard patrols with a dog in Ben Gurion airport near Tel Aviv, Israel, Tuesday, March 22, 2016. After the Brussels attacks, Israel briefly announced that all Israeli flights from Europe were canceled, then reinstated the flights, Israel Airports Authority spokesman Ofer Leffler said. Pini Schiff, former director of security at Ben-Gurion Airport, said the attack in the Brussels airport was âa colossal failureâ of Belgian security, and he said âthe chances are very lowâ that such a bombing could take place in Israelâs airport. Israel's Ben-Gurion Airport is considered among the most secure in the world, an outcome stemming from several Palestinian attacks on Israeli planes and travelers in the 1970s. (AP Photo/Ariel Schalit)
French soldiers check unattended boxes left on the platform at Gare De Lyon railway station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori)
Passengers of an ICE train leave the train at its final stop at the station in Aachen, Germany, near to the Belgian border Tuesday March 22, 2016. German police have increased security measures at the borders following the terrorist attacks in Brussels. (Ralf Roeger/dpa via AP)
Passengers at Warsawâs Frederic Chopin airport in Warsaw, Poland on Tuesday, March 22, 2016, pass by an information board that lists flights to Brussels as canceled, following deadly blasts at Busselsâ airport. (AP Photo/Czarek Sokolowski)
A German police officer guards a terminal of the airport in Frankfurt, Germany, Tuesday, March 22, 2016, when various explosions hit the Belgian capital Brussels killing several people. (AP Photo/Michael Probst)
Border guards patrol at Warsawâs Frederic Chopin airport in Warsaw, Poland on Tuesday, March 22, 2016 after security measures were increased at Polandâs airports following attacks in Brussels , Belgium. (AP Photo/Czarek Sokolowski)
Border Guards patrol at Warsawâs Frederic Chopin airport in Warsaw, Poland on Tuesday, March 22, 2016 after security measures were increased at Polandâs airports following attacks in Brussels , Belgium. (AP Photo/Czarek Sokolowski)
French police officers patrol outside the Gare du Nord train station, where high speed trains depart to Brussels, in Paris, Tuesday, March 22, 2016. Authorities in Europe and across the world tightened security at airports, railway stations, government buildings and other key points after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Francois Mori)
PARIS, FRANCE - MARCH 22: (FRANCE OUT) French police officers patrol at the Trocadero Plaza next to the Eiffel Tower on March 22, 2106 in Paris, France. Since this morning 400 policemen and gendarmes have been deployed to increase the security in airports, stations and public transportation around Paris and its region after the terrorist attacks in Brussels today. (Photo by Christophe Morin/IP3/Getty Images)
A police officer with a sniffer dog checks a trash bin at the airport in Prague, Czech Republic, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Petr David Josek)
Danish police patrol Copenhagen International Airport, in Kastrup, Denmark, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (Jens Dresling/POLFOTO via AP) DENMARK OUT
An electronic billboard displays two canceled flight to Brussels at Milan's Malpensa international airport, in Busto Arsizio, Italy, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Luca Bruno)
An armed British policeman stands on duty outside as tourists walk past Horse Guards parade in central London, Tuesday, March 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Alastair Grant)
London's Metropolitan Police Commissioner Bernard Hogan-Howe leaves the Cabinet Office in London, after a government emergency meeting in the wake of the attacks in Brussels, Tuesday, March, 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Alastair Grant)
Police officers patrol the check in area of the Milan's Malpensa international airport, in Busto Arsizio, Italy, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Luca Bruno)
A Eurostar train arrivals board shows the Brussels route is cancelled due to "Security Alert in Brussels", at St Pancras international railway station in London, Tuesday, March 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Matt Dunham)
Italian police officers patrol Leonardo Da Vinci airport in Fiumicino, near Rome, Tuesday, March 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Alessandra Tarantino)
A Italian police dog sniffs passengers' luggage at Leonardo Da Vinci airport in Fiumicino, near Rome, Tuesday, March 22, 2016. Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Alessandra Tarantino)
A member of the Counter Terrorism Centre (TEK) patrols the area in front of the Parliament in downtown Budapest, Hungary, Tuesday, March 22, 2016. Hungary raised its terrorism awareness level to grade 2 after a series of attacks in Brussels. (Zoltan Balogh/MTI via AP)
German police officers guard a terminal of the airportthe in Frankfurt, Germany, during tighter security measures Tuesday, March 22, 2016, when various explosions hit the Belgian capital Brussels killing several people. (AP Photo/Michael Probst)
Counter Terrorism Centre (TEK) personnel arrive with an APC vehicle at the parking facility of the Liszt Ferenc International Airport in Budapest, Hungary, Tuesday, March 22, 2016. Hungary raised its terrorism awareness level to grade 2 after a series of attacks in Brussels. (Zsolt Szigetvary/MTI via AP)
French soldier patrols in Gare De Lyon railway station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori)
French soldiers patrol in the subway entrance station in Paris, France, Tuesday, March 22, 2016. Authorities are tightening security at airports and on the streets of European cities after attacks on the Brussels airport and subways system that killed at least one person and injured many others. (AP Photo/Francois Mori)
Police officers patrol inside a terminal of the airport during tighter security measures in Barcelona, Spain, Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe.(AP Photo/Emilio Morenatti)
Tourist police officers patrol the Red Square in Moscow, Russia, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/ Pavel Golovkin)
Passengers queue at a check in area of the Milan's Malpensa international airport, in Busto Arsizio, Italy, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Luca Bruno)
PARIS, March 22, 2016-- Police officers patrol at Charles de Gaulle airport in Paris, capital of France, March 22, 2016. Security has been beefed up in France with 1,600 police officers deployed at airports, railway stations and bus stations since the attacks on Brussels Tuesday. (Xinhua/Theo Duval via Getty Images)
BUDAPEST, HUNGARY - MARCH 22: Hungarian counter-terrorism agents secure the Liszt Ferenc International Airport in Budapest, Hungary on March 22, 2016 following high level security alert following the morning explosions in Brussels. At least 34 people were killed and more than 100 injured in multiple explosions at an airport and metro station in Brussels on today's morning. (Photo by Arpad Kurucz/Anadolu Agency/Getty Images)
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The mystery investigators now want to clear up is whether a bomb was placed on the EgyptAir plane at Charles de Gaulle before it left France. The jet had also most recently been on trips to Asmara, in Eritrea, and Tunis, in Tunisia, before it arrived in Paris.

France has been through a series of heightened security alerts ever since the Charlie Hebdo and Bataclan shooting attacks in 2015, so security at Paris airports should have been super-tough.The Local reported:

"We are still not sure of [the cause], but the incident has triggered a series of checks," said an expert cited in Le Figaro.

A senior official at [Charles de Gaulle] said France's air police (GTA) would be reviewing video footage and other information relating to MS 804, the French daily said.

The official added: "Investigators will inevitably be interested in the ground crew... numerous salafists have been detected in the past, among those workers who had access to areas for loading and unloading aircraft. Sometimes there is complicity in airports. We must not hide that fact."

That bit about "numerous salafists" refers to the fact that the airport stripped about 70 workers of their security clearances after the November attacks, according to The Guardian, because of "worrying behaviour." The Local reported in December 2015:

Secure-zone clearance has been withdrawn for nearly 70 people working at two Paris airports following the November 13 terror attacks on the French capital, the boss of the airports company said on Sunday.

Augustin de Romanet, chief executive officer of Aeroports de Paris (ADP), said the prefecture -- the representative of the state -- which issues the badges had carried out a screening after the attacks on Paris, in which 130 people were killed and 350 injured.

"Nearly 70 red badges were withdrawn after the attacks, mainly for cases of radicalisation," he said in an interview with French media.

Around 85,000 people have security clearances at Paris's two airports, and they work for hundreds of sub-contractors, The Local reported:

"To be issued with a red badge, you have to be cleared by police, and if you work for a company that carries out security checks of in-flight luggage, you need three police checks," said Augustin de Romanet, chief executive officer of Aeroports de Paris (ADP).

A very small number of EgyptAir staff have been identified as security risks in the past.

An EgyptAir employee at the Sharm el-Sheikh airport in Egypt was arrested in January 2016 in connection with the bomb that was smuggled aboard the Russian MetroJet flight that blew up, killing 224 people.

Two years ago, someone wrote "We will bring this plane down" in Arabic on the underside of the same EgyptAir jetliner that crashed last week, in Cairo, according to The New York Times. The airline's security officials believe that was a random political act linked to Egypt's domestic troubles at the time.

And an EgyptAir pilot deliberately flew Flight 990 from New York into the Atlantic ocean, killing 217 people, in 1990.

In the latest search news, the Egyptian government is bringing in two companies that specialise in deep sea searches to help their hunt for the black box recorder for flight MS804.

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