KIEV - Pro-Russian militants armed with automatic weapons on Saturday took control of the police headquarters in the Ukrainian city of Kramatorsk, 150 km (95 miles) from the Russian border, a Reuters witness said.An organized military unit of over 20 men wearing matching military fatigues and carrying automatic weapon took over the building around 5 p.m. after arriving on at least two buses.Video footage showed the men taking orders from a commander and shooting from automatic rifles as they approached the building.