Dylann Roof has been convicted over the attack on nine black church members who were shot to death during a Bible study session in South Carolina last year.

A man who became one of the lasting images of the Boston Marathon bombing when he was wheeled away, ashen-faced, his legs severely injured, has told a court that he locked eyes with the bomber’s older brother before the explosives went off.

Dolphins can recognise the voice of a friend even after being separated for 20 years, a study has shown.