An oil tanker is on fire in the Baltic Sea off the coast of north-eastern Germany, the German Maritime Search and Rescue Service said on Friday, with a major operation under way. All seven crew members on the 73-metre Annika have been rescued, and no environmental damage has been caused so far, the environment ministry in the state of Mecklenburg-Vorpommern said. It added that no injuries have been recorded, contradicting earlier media reports. The ship was reportedly carrying 640 tons of heavy fuel oil when a fire broke out on board early on Friday. It is currently anchored in the Mecklenburg…