An unmanned rocket carrying medical supplies exploded , conflicting reports . The rocket 's launch had been delayed due to an engine leak , according to CNN 's sister channel . There was no immediately announcement as to what caused the launch 's failure .
An unmanned rocket carrying communications equipment exploded , media reports . The rocket 's launch had been delayed due to an engine leak , according to CNN 's sister network . There was no immediately indication as to what caused the launch 's failure .