TASER electronic stun guns are a form of torture that can kill, a UN committee has declared after several recent deaths in North America.
"The use of these weapons causes acute pain, constituting a form of torture,'' the UN's Committee against Torture said.
"In certain cases, they can even cause death, as has been shown by reliable studies and recent real-life events,'' the committee of 10 experts said.
Three men, all in their early 20s, were reported to have died in the United States this week, days after a Polish man died at Vancouver airport after being Tasered by Canadian police.
The man, Robert Dziekanski, 40, fell to the ground and died after the police officers piled on top of him.