A pressure cooker stuffed with gunpowder and shrapnel caused at least one of the blasts at the Boston Marathon that killed three people and injured 176 others, law enforcement sources said.
New details have emerged about the Boston Marathon bombing suspects as the surviving brother's medical condition marginally improved and two of his alleged victims were buried, including an 8-year-old boy.
ANALYSIS: North Korea is sometimes mocked as the mouse that roared, one of the poorest countries in the world threatening two economic and military giants, the United States and South Korea.
Prince pounded his rhinestone-encrusted cane into the floor to make a point. "I don't have time for old people," he insisted. "I want to work with young people."
James Holmes, accused of killing a dozen people and wounding scores more in a July shooting spree at a Colorado movie theatre, has pleaded not guilty by reason of insanity.
Back when she was in college, software developer Monica Wilkinson says, she used to dream of "being able to carry a computer in my head," instead of lugging her books and laptop all over campus.
The political speeches get the headlines but most of the 70,000-plus people attending the National Rifle Association's annual meeting are here to see an eye-popping extravaganza of guns and gun culture.
A bride-to-be was among five killed when a limousine carrying nine women as part of a bridal shower burst into flames on a California bridge, authorities say.
A lightning-quick experimental aircraft made history when it flew at speeds up to 4830kmh above the Pacific Ocean in a test flight, reigniting decades-long efforts to develop a vehicle that could travel faster than a speeding bullet.
When a Russian intelligence service told the CIA that Tamerlan Tsarnaev had become an Islamic radical looking to join underground groups, the agency put his name in the government's catch-all database for terrorism suspects.
Fox Broadcasting has pulled a recent episode of "Family Guy" from websites after edited clips of the animated series appeared to portray a bombing, mayhem and deaths at a Boston Marathon.
Eric Giandelone had finished the Boston Marathon and was drinking a cup of coffee, watching the other runners cross the finish line, when he heard a loud blast.
Just five months after Washington state and Colorado voted to legalise marijuana for recreational use, a poll has found that a majority of Americans now agree and say it should not be illegal to smoke the drug.