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 . Video of the incident showed huge plumes of white and copper-colored smoke streaming across the sky . There was no immediately announcement as to what caused the launch 's failure .
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 .