The U.N. aviation authority has sent a warning to North Korea over its jamming of GPS signals near the inter-Korean border this year, after Seoul accused the DPRK of endangering hundreds of civilian aircraft.

The International Civil Aviation Organization (ICAO) adopted a resolution last week condemning the GPS jamming by North Korea between May 29 and June 2, according to a press release by South Korea’s foreign ministry.

“This marks the first instance where the ICAO explicitly identified North Korea as the perpetrator of GPS signal disruptions,” the ministry stated, noting that the ICAO previously addressed such jamming in 2012