Authorities in Bosnia-Herzegovina say they have detained four people on suspicion of planning to join the Islamic State (IS) group.
Prosecutors said one of them, 22-year-old Senad Kostac, was detained in Turkey while trying to reach Syria and handed over to Bosnian authorities.
The other three, aged 26, 27 and 55, were arrested near the northwestern town of Velika Kladusa.
Several hand grenades, land mines, a machine gun, ammunition, and a flag of the IS group were seized during a police raid.
The operation followed similar raids in the Sarajevo area in December, when 11 people were arrested on suspicion of having links with the IS group. Eight of them were remanded in custody.
Bosnia hardened its legislation last year, allowing sentences of up to 20 years in jail for militants and their recruiters.