More than a dozen members of a Turkish national youth organization were taken into custody in Turkey after local authorities say they assaulted two US Marines.

The Marines, assigned to the 24th Marine Expeditionary Unit, were on liberty in Izmir when the assault occurred Monday afternoon, the US Sixth Fleet said in a statement.

The Marines were assaulted by members of the Turkish Youth Union, according to local authorities, a nationalist anti-American organization that has attacked US service members before.

Video of the assault confirmed by a US official shows several people holding the Marines by force as a speaker on the street screams loudly. One of the Marines shouts “Help!” several times, while the crowd puts a bag over the head of another Marine. The crowd then starts chanting, “Yankee, go home!”