North Korean rocket carrying its second spy satellite explodes in mid-air

A rocket launched by North Korea to deploy the country's second spy satellite exploded shortly after liftoff Monday, state media reported, in a setback for leader Kim Jong Un's hopes to field satellites to monitor the U.S. and South Korea.

Monday's failed launch came hours after leaders of South Korea, China and Japan met in Seoul in their first trilateral meeting in more than four years. It's highly unusual for North Korea to take provocative action when China, its major ally and economic pipeline, is engaging in high-level diplomacy in the region.

The launch drew rebukes from the North's neighbours because the UN bans North Korea from conducting any such launches, viewing them as covers for testing long-range missile technology.

The North's official Korean Central News Agency said it launched a spy satellite aboard a new rocket at its main northwestern space center. But KCNA said the rocket blew up during a first-stage flight soon after liftoff due to a suspected engine problem.

KCNA cited the unidentified vice-director of the National Aerospace Technology Administration as saying that a preliminary examination showed that the explosion was related to the reliability of operation of the newly developed liquid oxygen-petroleum engine. He said other possible causes will be investigated, according to KCNA.

Japan's government briefly issued a missile warning for the southern prefecture of Okinawa, urging residents to take shelter inside buildings and other safer places. The warning was lifted later because the region was no longer in danger, Chief Cabinet Secretary Yoshimasa Hayashi said.

Earlier Monday, North Korea had notified Japan's coast guard about its plans to launch "a satellite rocket," with a warning to exercise caution in the waters between the Korean Peninsula and China and east of the main Philippine island of Luzon during a launch window from Monday through June 3.

North Korea has steadfastly maintained it has the right to launch satellites and test missiles.

Japanese Defence Minister Minoru Kihara called the North's launch "a serious challenge to the entire world." South Korea's Unification Ministry called a satellite launch by the North "a