NEW : South Korean workers enter industrial complex despite severing of hotline . NEW : The North clears them to cross the border through another line , Yonhap says . Another U.S. official said there is a lot of uncertainty about North Korea 's intentions . Comment: The announcement follows a slew of recent threats from North Korea .
NEW : South Korean workers enter industrial complex despite severing of hotline . NEW : The North clears them to cross the border through another line , Yonhap says . Comment: The announcement follows a slew of recent threats from North Korea .