Scientists had been testing Sarin - one of the world's deadliest nerve gases - on him.
The deadliest tornado, which struck March 18, 1925, killed 695 people in Missouri, Illinois and Indiana.
April is the deadliest month for tornadoes, and the numerical frequency peaks in May.
Tuesday's recommendations were timed to coincide with the deadliest alcohol-related crash in U.S. history.
K. Rowling among novelists for whose publishers the deadliest sin is spoiling the plot.
And an art to selling something named for one of the world's deadliest natural poisons.
The bombing was the deadliest targeting foreign civilians in over a decade of war.
It was the state's deadliest avalanche accident since 1962, the Colorado Alpine Rescue Team said.
The Colorado Alpine Rescue Team said this was Colorado's deadliest avalanche accident since 1962.
Four people have been arrested in connection with the blaze, Brazil's deadliest in five decades.
The deadliest of these actions was a revolutionary theocracy's seizing of power in Iran.
In its purest form, botulinum is one of the deadliest poisons known to humans.
Local newspaper Le Dauphine said it was the deadliest accident in the French Alps since 2003.
Many seemed to contribute to the deadliest cancers, including tumors of the lung, breast and gut.
But for the US's deadliest sniper, remorse does not seem to be an issue.
At least 139 people were killed in that attack, one of the country's deadliest.
The Sangin district in Afghanistan's Helmand province has become the deadliest posting for the British military.
That's the deadliest single month since August 2010, when the toll was 426, the ministry said.
It appeared to be the world's deadliest nightclub fire in more than a decade.
Another example of how army meddling goes awry is Hizbullah, Turkey's deadliest home-grown Islamic terrorist outfit.
If this attack did involve ETIM, it would be the deadliest yet attributed to the group.
The violence, the country's oldest and deadliest ethnic conflict, has claimed more than 30, 000 lives.
Another 100 were injured in what amounted to the the deadliest day of the year in Iraq.
We are less than eight years removed from the deadliest attack on American soil in our history.
The deadliest such alleged attack was in the Khan al-Assal village in the Aleppo province in March.
Today's violence comes on the heels of the single deadliest bombing since the start of the war.
The deadliest hurricane in U.S. history hit Galveston, Texas, in 1900 and killed 8, 000 to 12, 000 people.
Smallpox has killed 500 million people this century alone, making it the deadliest disease known to man.
It was the deadliest battle with suspected rebels since President Alan Garcia took office in July 2006.
But last year was the deadliest for Iraqis since the invasion, so the comparison, says retired Army Col.
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