The drugs used in the botched lethal injection of Clayton Lockett "weren't working as they were designed to", a prison spokesman has said.
Jerry Massie told reporters:
"We believe that a vein was blown and the drugs weren't working as they were designed to. The director ordered a halt to the execution."
More top news
Merrill Lynch has been fined £34.5 million for failing to report 68.5 million transactions, the Financial Conduct Authority has said.
Most people back a change in the law to ban unpaid internships that last for more than four weeks, a new poll suggests.
The favourites to win the Venice marathon finished behind a local runner - after they were led along the wrong route by a motorcycle guide.