The International Telecommunciation Union has sent a warning to North Korea for failing to provide the frequency and other information about a satellite put into orbit in a widely condemned rocket launch, an official said.

The U.N. agency sent a letter under the name of Radiocommunication Bureau Director Francois Rancy to the North's posts and telecommunications minister, Kim Kwang-chol, on Monday, saying it is "extremely concerned and alarmed" that Pyongyang has provided no information, ITU spokesman Sanjay Acharya told Yonhap News Agency.

Acharya said that countries launching satellites are supposed to provide the frequency and other technical information to member nations, and that the ITU decided to send the letter because the North showed no response to repeated demands for such information.

The ITU also provided information on the North's violations to the U.N. Security Council, he said. (Yonhap)