File photo. [AP]

Two Turkish-flagged commercial vessels collided off Istanbul in the Sea of Marmara on Wednesday and contact has been lost with one of the ships, the Istanbul governor’s office said.

The ⁠Turkish-flagged Alsu, en ⁠route to the Aegean port of Aliaga, and the Turkish-flagged Tugberk Imamoglu, ​en route to the Black ⁠Sea port of Karadenizeregli, collided off the Silivri district of Istanbul ⁠at around ‌3 a.m. (0000 ⁠GMT) on Wednesday, the governor’s office said in a statement.

Coast guard ships ​and helicopters were dispatched to the scene ‌for search and rescue, and there was no visible damage on the Alsu, the statement said. But ​authorities were unable to establish contact with the Tugberk Imamoglu and its 10 crew members.

According ‌to data ​from the Istanbul Chamber of Maritime Commerce, the Tugberk Imamoglu, owned by ⁠Zeybe Denizcilik, operates as a ‌bulk carrier, while the Alsu, ​owned by Ozpulathane Deniz Tasimaciligi, operates as a chemical ‌tanker.