It was an antibody that primes the immune system to attack and kill tumors.

FORBES: Magazine Article

Mr Esseghaier, 30, and Raed Jaser, 35, are charged with conspiracy to carry out an attack and kill people.

BBC: Tunisian held in New York over Canada train bomb plot

In recent years, evidence has built that the immune system can sometimes attack and kill cancer cells--sometimes--but that cancer finds ways to fight back and evade or blunt the attack. (See "Cancer Miracles") For some people with advanced cancer, ipilimumab may be just enough to trigger a full-fledged anti-tumor attack.

FORBES: Health Care

And, while dingoes are largely harmless, they have been known to attack humans and even kill.

BBC: The perfect trip: Queensland

But if he were spotted walking down the street in Belfast, a lot of individuals very, very angry at what he had done--they might attack him and possibly even kill him.

NPR: Irish Spy May Hurt N. Ireland Peace Process

The police said the attack was sectarian and a "serious attempt to kill or injure someone".

BBC: Man charged in bomb attack

Three Saudis and seven Moroccans went on trial this week in Casablanca, Morocco, accused of planning an attack against NATO ships in the Strait of Gibraltar and plotting to kill tourists.

ECONOMIST: The hunt continues | The

Sensing a quick kill, Australian captain Steve Waugh recalled McGrath to the attack and the Aussie paceman responded by dismissing Samir Dighe with the final ball of his 10th over.

BBC: India crushed by Aussies

The brothers were later charged with attempted grievous bodily harm with intent and making a threat to kill in connection with a separate attack on another 11-year-old boy in Doncaster a week earlier.

BBC: Young brothers admit boys' attack