The government has a new lead in the investigation of the launch failure of the Naro space rocket in June last year.

The Education, Science and Technology Ministry and a probe committee on the failed launch said Thursday that the space rocket experienced vibrations just 136-point-three seconds after takeoff. The rocket exploded about one second later, ending the transmission of data.

Last June’s launch was South Korea’s second failed attempt to use Naro to put a satellite into orbit. The first was in 2009.

The committee said that it’s looking into the possibility that the combustion of a motor propellant set off a series of explosions. It said the combustion may have been caused by the malfunctioning of the rockets second-stage flight system which South Korea manufactured.

Based on the new findings, the government will begin a joint investigation with Russia next month to determine the exact cause of the unsuccessful rocket launch.