A former Guantanamo Bay inmate is among six people from an alleged ISIS recruiting network who were detained on Tuesday.

Sabir Mahfouz Lahmar was one of the six suspects arrested in Bordeaux as part of the crackdown, a French judicial source said.

Lahmar was freed from the US detention center in Cuba in 2009 after France agreed to accept him, the official, who spoke on condition of anonymity, revealed.

The 48-year-old was one of six Algerians detained in Bosnia in 2001 on suspicion of plotting to bomb the US embassy in Sarajevo.

Sabir Mahfouz Lahmar (left and right) has been arrested for allegedly being part of an ISIS recruitment network in France eight years after he was freed from Guantanamo Bay

The Justice Department later backed off the allegations, but held the men at Guantanamo for years.

Former French President Nicolas Sarkozy agreed to take him in April 2009, and Lahmar 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.

As of January 19 this year, there were 41 prisoners remaining in the center.