South Korea strengthened security measures because of threats from Pyongyang

South Korean police today announced that it had strengthened security measures against possible attack from Pyongyang after North Korea's threats of military response to the joint exercises conducted by U.S. and South Korean military said Tuesday. Special police units and teams with sniffer dogs patrolling the main metro stations and airports, as security is increased and in most public places. Parts of the security forces and armored vehicles were deployed in the capital Seoul around the U.S. embassy, police said. On Monday began annual military exercises conducted jointly by American and South Korean army and received a threat from North Korea.