South Korean officials say they are no longer detecting GPS jamming signals that affected hundreds of civilian flights into and out of the country over a two-week period.

South Korea's transport ministry confirmed to VOA that the signals, which originated from the North Korean border city of Kaesong, have not been noticed since late Sunday.

Officials say the interference affected flights at the capital's two main airports as well as shipping.

The affected planes relied on alternate navigation systems, and officials say none of the flights was in danger.

Similar jamming in the past has been traced to North Korea, in an apparent attempt to disrupt air and sea traffic in the South.

The latest attempt began April 28, days after Pyongyang threatened “special military action” against the government of South Korean President Lee Myung-bak.