CIA, FBI flagged Boston suspect
Both the CIA and the FBI flagged the deceased Boston bombing suspect over possible terror ties, but he slipped through the fingers of investigators.
Charges dropped against US ricin suspect
A US man accused of sending a poison-laced letter to the White House was released from jail with his charges dismissed Tuesday as officials searched the home of a rival.
US 'pinged' when Boston suspect flew to Russia
US lawmakers learned Tuesday that security monitors "pinged" when a Boston bombing suspect flew to Russia last year, as concerns grew about possible intelligence sharing failures.
Canada nabs two in alleged Qaeda-backed train plot
Two foreign nationals have been arrested in Canada in connection with what federal police said Monday was a plot backed by Al-Qaeda to derail a passenger train in the Toronto area.
Threatening letter, powder sent to S. Korea minister
South Korea's defence minister received Tuesday a package containing a threatening letter and suspicious powder, in what his ministry described as an attempted act of "terror".
Boston bomb suspect blames brother: report
Boston bombing suspect Dzhokhar Tsarnaev has told investigators his brother was the leader in last week's deadly attacks, and that no international terrorist groups were behind them.
Tsarnaevs never lived in Kazakhstan: Foreign Ministry
Kazakhstan Foreign Ministry has found no evidences that the suspects of Boston bombing Tamerlan and Dzokhar Tsarnaevs lived in Kazakhstan.
Boston bombing suspect awake, responding: reports
The surviving Boston bombing suspect is awake and responding to questions in writing.
US asks Interpol for info on bombs like those in Boston
US authorities have asked Interpol to provide any information its members around the world might have on bombs similar to the ones used in the Boston Marathon attack.