Gibraltar has freed an Iranian oil tanker detained last month on suspicion of sanctions-busting, despite a last-minute plea by the US authorities.

The UK territory received written assurances from Iran that the ship would not discharge its cargo in Syria.

Grace 1, carrying Iranian oil, was stopped by Royal Marines on 4 July, triggering a standoff with Tehran.

Gibraltar's chief justice, Anthony Dudley, said no US application was currently before the court.

An independent legal body would make a determination on the American request, Gibraltar's Chief Minister Fabian Picardo said in a statement.

The tanker remained off Gibraltar early on Thursday evening but, according to witnesses speaking to Reuters news agency, its prow had moved around by at least 180 degrees.

It was unclear whether this was because of strong sea currents or because it was preparing to leave.

The UK Foreign and Commonwealth Office said Iran must abide by the assurances it had given that the tanker would not proceed to Syria, which is under EU sanctions.

The FCO described Syria as a "regime that has deployed chemical weapons against its own people".

BBC