FOUR Greenpeace activists were arrested today after scaling a building outside the Foreign Office in protest over delays in signing an international treaty protecting oceans.

The protesters unfurled a banner as they suspended themselves from columns on the King Charles Street Archway in Westminster before coming down voluntarily.

Three men and one woman were safely detained and arrested under Section 1 of the Public Order Act, and on suspicion of aggravated trespass and criminal damage, the Metropolitan Police said.