Two Turkish-flagged commercial vessels collide off Istanbul, governor's office says

Two Turkish commercial vessels collided in the Sea of Marmara. Contact was lost with the Tugberk Imamoglu and its ten crew members. Coast guard ships and helicopters were dispatched for a search and rescue operation. The Alsu, a chemical tanker, sustained no visible damage after the collision. The search and rescue efforts for the missing vessel were still underway.