British police have released three teens on bail after their arrest for trying to travel to Syria to join the Islamic State group.

The families of the boys — two 17-year-olds and one 19-year-old — alerted authorities when the teens failed to return from Friday prayers. Police alerted Turkish authorities, who intercepted the teens and returned them to Britain.

Police arrested the teens on suspicion of preparation of terrorist acts. They were bailed late Sunday.

Their arrests come just weeks after an international search began for three teenage girls who left Britain and traveled to Syria to become so-called "jihadi brides."

Scotland Yard believes some 600 Britons have traveled to Syria and Iraq to join IS since the start of the conflict.