A Libyan man accused of making the bomb which destroyed Pan Am flight 103 over Lockerbie 34 years ago is in United States custody, Scottish authorities have said.
The US announced charges against Abu Agila Masud two years ago, alleging that he played a key role in the bombing on 21 December, 1988.
The blast on board the Boeing 747 left 270 people dead.
It is the deadliest terrorist incident to have taken place on British soil.
All 259 passengers and crew on board the jumbo jet bound to New York from London died while another 11 people were killed in Lockerbie when wreckage destroyed their homes.
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Last month it was reported that Masud had been kidnapped by a militia group in Libya, leading to speculation that he was going to be handed over to the American authorities to stand trial.
A US Justice Department spokesperson told the Reuters news agency that Masud would make an initial appearance in a federal court in Washington.
Five years ago he was serving a prison sentence in Libya for bomb-making.