The killers of Hamas leader Mahmoud al-Mabhouh first injected him with a muscle relaxant and then suffocated him, Dubai police said Sunday.
Toxicology tests on the Hamas leader found significant amounts of succinylcholine, a drug that is used to relax muscles during surgery or as an anesthetic.
"The assassins used this method so that it would seem that his death was natural," Maj. Gen. Al Mazeina said.
But signs indicated that al-Mabhouh resisted his attacker as they suffocated him, police said.
The latest determination are in line with what police disclosed earlier and told al-Mabhouh's relatives.