PARIS -- A judicial official says that four men suspected of belonging to a network sending French residents to the tribal zones of the Pakistan-Afghanistan border to train for combat have been charged.

A woman who was detained with them has been released.

The official said on Saturday that the men, aged 25 to 30, have been charged with "criminal association linked to a terrorist enterprise."

The official said the four are also suspected of plotting to kill the head of the Grand Mosque of Paris, Dalil Boubakeur -- but there wasn't enough evidence to justify charges. The official, not authorized to discuss cases publicly, demanded anonymity.

Two of the suspects were detained Monday after disembarking from a flight from Egypt. The others were picked up Tuesday in Paris.