Two off-duty Marines from the 24th Marine Expeditionary Unit were attacked by members of the Turkish Youth Union while on a port visit in Izmir, Turkey.

The attackers forced a bag over one Marine’s head, and 15 people were arrested in connection with the incident.

The Marines were evaluated at a local hospital but were unharmed and have returned to their ship, the USS Wasp, Military.com has reported.

The U.S. Embassy thanked Turkish authorities for their swift response. The assault appears to be linked to tensions over U.S. involvement in the Israel-Hamas conflict.

An investigation is ongoing.

Written by B.C. Begley