French intelligence agents have arrested four people believed linked to terror suspects detained in Syria several months ago, officials said Wednesday. Three men and one woman were detained Tuesday and were in custody in Tours, a city southwest of Paris, according to the French national police. The four are believed linked to two Frenchmen charged in November with suspected terrorist ties after they were expelled from Syria, police said. Those men, from near Tours, had traveled to Syria in October and were allegedly planning to continue to Iraq, but were arrested by Syrian authorities who suspected them of terrorist connections, according to French judicial officials. Investigators are trying to determine whether the men were traveling on their own or as part of a broader terrorist network.