A seized oil tanker at the center of a standoff between the UK and Iran is free to set sail, despite eleventh-hour efforts by the United States to halt the move to release it.

The Supreme Court in the British territory of Gibraltar approved the release of the Grace 1, which was seized off the country’s coast by authorities last month, after officials said they no longer wished to detain it.
Gibraltar said it had received assurances from Iran and the owners of the oil that, were the tanker to be released, its cargo would not be taken to Syria, which would be in breach of European Union sanctions.
The ship was seized six weeks ago as it passed through Gibraltar’s territorial waters. Two weeks later, Iran seized a British ship in the Gulf, in what was widely regarded as a tit-for-tat operation.

Source: Seized Iranian tanker released despite US efforts to halt the move