The collision occurred 18 nautical miles (33 kilometres) off the Silivri district on the western edge of Istanbul province, the governor's office said on X. Turkish officials say a search operation has been launched off the coast of Istanbul after two ships collided Key points and original sources are listed below.

• The collision occurred 18 nautical miles (33 kilometres) off the Silivri district on the western edge of Istanbul province, the governor's office said on X.S1

• Turkish officials say a search operation has been launched off the coast of Istanbul after two ships collidedS2

• Coast guard vessels and a helicopter are searching for the cargo ship and its 10 crew members off the coast of Istanbul. Authorities say they lost contact after the boat crashed into another ship overnight.S3

• Coast guard vessels and a helicopter are searching for 10 missing crew members off the coast of Istanbul. Authorities say they lost contact after the bulk carrier crashed into a chemical tanker off the coast of Istanbul.S4