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A former Guantanamo Bay inmate is among six people from an alleged Isis recruiting network who have been detained in France .
Among the suspects arrested was Sabir Mahfouz Lahmar, who was freed from the US detention centre in Cuba in 2009 after France agreed to accept him, said a judicial official.
He was one of six Algerians detained in Bosnia in 2001 on suspicion of plotting to bomb the US embassy in Sarajevo.
The US Justice Department later backed off the allegations, but held the men at Guantanamo for several years. The former French President, Nicolas Sarkozy, agreed to take Lahmar in April 2009 and he moved to Bordeaux later that year.
The French official said Lamar, at 48, is the oldest of the four men and two women who were arrested and said that there were no indications the group was plotting an attack.
Five of the suspects were detained in Bordeaux and one in Paris in a series of raids on Monday.
Show all 23 1 /23Gunman attack on the Champs-Elysees Gunman attack on the Champs-Elysees Police officers secure the area after a gunman opened fire on Champs Elysees. One police officer has been killed, and a second injured by a gunman on The Champs Elysees
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Gunman attack on the Champs-Elysees Police officers block the access of a street near the Champs Elysees in Paris after a shooting in which one police officer was killed and another wounded. The attacker was killed in the incident on the world famous boulevard that is popular with tourists
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Gunman attack on the Champs-Elysees Police officers control passersby near the Champs Elysees in Paris after a shooting. One police officer was killed and another wounded today in a shooting on Paris's Champs Elysees, police said just days ahead of France's presidential election. The attacker was killed in the incident on the world famous boulevard that is popular with tourists.
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Gunman attack on the Champs-Elysees People run away after a shooting at the Champs Elysees in Paris
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Gunman attack on the Champs-Elysees French people hold their hands in the air after a shooting in which a police officer was killed along with the attacker and another police officer wounded in an attack on the Champs Elysees in Paris
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Gunman attack on the Champs-Elysees Bystanders are frisked by police officers near the Champs Elysees avenue in Paris, France, after a fatal shooting in which a police officer was killed along with an attacker
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Gunman attack on the Champs-Elysees People hold their hands up as they walk towards police officers before being controlled near the site of a shooting at the Champs Elysees in Paris. France's interior ministry said the attacker was killed after opening fire on police in the early evening on the world-famous boulevard
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Gunman attack on the Champs-Elysees Police look through binoculars as officers secure the area after a gunman opened fire on Champs Elysees
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Gunman attack on the Champs-Elysees A tourist is blocked by French soldiers next to the Champs Elysee Avenue during ongoing police operations after a shooting in which two police officers were killed along with their attacker and another police officer wounded in a terror attack near the Champs Elysees in Paris, France
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Gunman attack on the Champs-Elysees A tourist is blocked by French soldiers next to the Champs Elysee Avenue during ongoing police operations after a shooting in which two police officers were killed along with their attacker and another police officer wounded in a terror attack near the Champs Elysees in Paris, France
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Gunman attack on the Champs-Elysees French Police officers, after a shooting in which two police officer were killed along with their attacker and another police officer wounded in an attack near the Champs Elysees in Paris, France
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Gunman attack on the Champs-Elysees Forensic experts and police officers examine evidence from a police van on the Champs Elysees in Paris, France, after a fatal shooting in which a police officer was killed along with an attacker
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Gunman attack on the Champs-Elysees Police investigators inspect the car used by the attacker on the Champs Elysees Avenue after a policeman was killed and two others were wounded in a shooting incident in Paris, France
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Gunman attack on the Champs-Elysees A French soldier patrols on the Champs Elysees in Paris after a shooting. One police officer was killed and another wounded today in a shooting on Paris's Champs Elysees, police said just days ahead of France's presidential election. France's interior ministry said the attacker was killed in the incident on the world famous boulevard that is popular with tourists
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Gunman attack on the Champs-Elysees Police officers patrol near the site of a shooting at the Champs Elysees in Paris
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Gunman attack on the Champs-Elysees French military secure the area after a gunman opened fire on Champs Elysees
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Gunman attack on the Champs-Elysees French military secure the area after a gunman opened fire on Champs Elysees
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Gunman attack on the Champs-Elysees Police secure the area after a gunman opened fire on Champs Elysees in Paris, France
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Gunman attack on the Champs-Elysees One police officer has been killed, and a second injured by a gunman on The Champs Elysees
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Gunman attack on the Champs-Elysees Police officers secure the area after a gunman opened fire on Champs Elysees
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Gunman attack on the Champs-Elysees Police secure the area after a gunman opened fire on Champs Elysees.
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Gunman attack on the Champs-Elysees French Prime Minister Bernard Cazeneuve, flanked by Interior Minister Mathias Fekl and Justice Minister Jean-Jacques Urvoas, speaks to the media outside the Elysee Palace after a defense council meeting in Paris, France
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Gunman attack on the Champs-Elysees A damaged window is pictured on the Champs Elysees boulevard in Paris
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The arrests follow a series of foiled Isis-linked terror plots in France , which remains under a repeatedly extended state of emergency.
The country has been the target of terror attacks leaving around 240 people dead since 2014, including massacres in Paris and Nice.
Vigilance has been increased since a suicide bombing in Manchester killed 22 people last week, with police investigating the bomber's potential foreign links.
Isis has called for an escalation in global terror attacks by its followers during the Islamic holy month of Ramadan .
Additional reporting by Associated Press
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