Exposure to heavy traffic fumes raises heart attack risk for the following six hours, researchers discover.

Mexican prosecutors drop terrorism charges against two people accused of using Twitter and Facebook to spread false rumours about gang violence.

Google's executive chairman denies that the company fixes its search results to promote its own websites and services.

Wikileaks founder Julian Assange criticises a UK publisher for releasing drafts of his autobiography without his approval.

Barack Obama tells the Palestinian president he will veto a bid for UN membership but Mahmoud Abbas will not drop the plans, the White House says.

A charity launches a legal challenge over government plans to axe legal aid for victims of medical negligence.

Troy Davis is executed in Georgia for the shooting of a policeman in 1989, in what supporters claim is a miscarriage of justice.

A Devon MP says £500,000 spent on an Arctic island Olympic arts project could have been better spent on community arts projects.