A man has admitted murdering his brother and attempting to murder his brother's girlfriend in a New Year's Day house fire.

A man has been arrested in connection with the death of his brother and the alleged attempted murder of his parents and his brother's girlfriend in Scotland.

Nasa rover Curiosity has beamed back pictures of bedrock that suggest a fast-moving stream, possibly waist-deep, once flowed on Mars – a find that the mission’s chief scientist called exciting.