Search and rescue operations under way as authorities lose contact with 10 crew members after a vessel collision near Istanbul.

Turkiye’s coastguard has launched a search and rescue operation after two Turkish-flagged commercial vessels collided off Istanbul and contact was lost with one vessel and its crew of 10.

The collision took place at 3am (00:00 GMT) in the Marmara Sea a little more than 20 miles (32 kilometres) south of Silivri, a suburb of Turkey’s largest city, the Istanbul governor’s office said in a statement on Wednesday.

Contact was lost with the crew of the Tugberk Imamoglu, flagged to Turkey, after the collision with the Turkish-flagged Alsu, which appeared undamaged, the governor’s office said.

“Numerous naval units from the coast guard’s Marmara and Bosphorus Command and a coast guard helicopter were dispatched to the scene,” the office said.