NEW : North Korea fully reopens its border to South Koreans without explanation . The border closing was part of a recent series of aggressive moves by North Korea , which included cutting the last remaining communications channel between North and South ; saying that the North could not guarantee the safety of South Korean passenger jets in its airspace during the annual joint military exercises ; and threatening to retaliate if a `` satellite '' launch from its northeastern coast was intercepted , saying interference would `` mean a war . '' U.S.-S. Korea closed border March 9 because of North Korea military exercises . Border partly opened March 9 , allowing 300 South Koreans allowed to go home . Stranded South Koreans mostly work at joint industrial complex in border town Lee Jong-joo .
NEW : North Korea fully reopens its border to South Koreans without explanation . U.S.-S. Korea closed border March 9 because of North Korea military exercises . Border partly opened March 9 , allowing 300 South Koreans allowed to go home . Stranded South Koreans mostly work at joint industrial complex in border town Lee Jong-joo .