Naamen Meziche was arrested on a bus along with three other French nationals in southwestern Pakistan in May, 2012, on suspicion of training militant networks and preparing terrorist attacks, the official said.
Pakistan deported them all to France in April, except Meziche, who was deported on Monday evening. The men have been held on suspicion of conspiring to commit terrorist acts.
Meziche, who is of Algerian origin, is suspected by French security officials of being a member of al Qaeda.
"We hope that confronting Meziche with the three others will enable us to find out more about this cell and its exact role within al Qaeda," the prosecutor's office aide said, declining to give further details.
No lawyer for Meziche could immediately be reached for comment.
According to French and German media reports, Meziche lived a large part of his life in Hamburg in northern Germany.
He attended the same Hamburg mosque as some of the men behind the September 11, 2001 attacks in the United States and he knew their ringleader, Mohammed Atta, according to the reports.
French officials say they are increasingly worried about the threat of their own nationals travelling abroad to fight in Syria's civil war and one day returning to carry out attacks at home.
Dozens of Frenchmen travel each year to remote places in Africa and Asia viewed as strongholds of al Qaeda to train or fight as Islamic militants, security sources say.
Many are arrested on their return to France.
A man who killed seven people in Toulouse in March last year, Mohamed Merah, had also previously travelled to Pakistan, as well as Afghanistan.
COMMENTS (9)
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There is always a drama presented by ET ...
and what about the thousands of Afghans in Pakistan !!
Sorry, we have loads of our pwn problems, I can't share my bread with miscreants, and extreemists, go back home please !
@Ariba: Pakistanis especially mullahs are the biggest supporters of terrorism. Learn to denounce the Taliban in your own country before denouncing others.
@Ariba: You are silly. You are showing a typical Muslim mentality whatever they have has been sent to them by outsiders. Look inside your country. What interest would France have in sending terrorists to Pakistan? Like Pakistan France is not known as a haven for terrorists. These nationals were all Muslims and must have come to Pakistan to escape French police.
Taliban are not going to be happy about losing their "precious assets."!!
what is going on here bhai
France should stop supporting terrorism inside Pakistan.
Pakistan seems to be getting only these type of tourists nowadays.
That is great. Good Riddance! Catch each one of these foreign terrorists and deport them to their homelands. If their governments do not take them, hand them over to the Americans. Make Pakistan famous for its zero tolerance toward terrorism and terrorists