France, Jan 08 (ANI): Helicopters were seen flying over the northeastern French town of Dammartin-en-Goele on Friday (January 9) as at least one hostage was seized during the police search for two brothers suspected of carrying out the attack on satirical publication Charlie Hebdo, according to police sources. There was heavy security in the town, and five helicopters were seen flying overhead on Friday morning. The French Interior Minister confirmed an operation was taking place there. A police source said the two suspects had been sighted in the town, where at least one person was taken hostage.