A Turkish cargo ship with 10 crew members sank near Istanbul after colliding with a tanker, and officials said no survivors had been found. The vessel, Tugberk Imamoglu, went down in the Marmara Sea at about 3 a.m. Wednesday after hitting the Turkish-flagged tanker Alsu, according to the General Directorate of Maritime Affairs. An emergency signal was received, and a lifeboat and debris from the cargo ship were located, but there was no sign of the crew. Transport Minister Abdulkadir Uraloglu said all 10 aboard, including the captain, were Turkish and that the sinking happened rapidly, in about 11 minutes. “No one has been found alive,” he said. Search efforts involved two helicopters and 12 search-and-rescue vessels. Separately, Turkish naval units were assisting the search for the passenger ferry Filo Jet, which sank off the coast of Cyprus on Sunday. Eight people died in that sinking and 20 remained missing.