Second execution delayed in US after first botched

The execution of a US man Tuesday -- using an untested lethal injection protocol -- was botched, leading authorities to immediately postpone a second execution planned for two hours later, Oklahoma prisons authorities said.

The director of prisons ordered the execution of Clayton Lockett stopped, three or four minutes after the start of the injection, at 6:23 pm (2323 GMT), citing a "vein failure," but the inmate died of a "massive heart attack" at 7:06 pm after receiving all three drugs. The director immediately ordered a 14-day delay on the execution of Charles Warner, prisons spokesman Jerry Massie told AFP.