In this Greek Coast Guard photo released on Tuesday, July 30, 2013, coast guard officers in Chios island, eastern Aegean Sea watch a 7-meter (23-foot) speedboat following the arrest of six men suspected of ferrying explosives and weapons. Counterterrorism police detained 12 people during raids in Greece on Tuesday following the arrest across the Aegean Sea to Turkey. The suspects taken into custody during the raids were detained during house searches in Athens and Greece’s second largest city, Thessaloniki. A senior police official identified the six arrested men as three Greeks and three Turkish nationals. He said police are investigating whether the Turks are involved in militant activities in Turkey. (AP Photo/Greek Coast Guard)

ATHENS, Greece (AP) — Two Greek and two Turkish men have been charged with multiple terrorism-related offenses after being arrested on a speedboat carrying weapons near the Turkish coast.

Judicial authorities said Thursday that the four men being held on the east Aegean Sea island of Chios had been charged with membership in a terrorist organization, and possession of weapons with intent to use in acts of terrorism.

The suspects were arrested this week transporting anti-tank weapons, handguns and hand grenades, as well as improvised explosive devices.