UK, FBI delegations visit Libya in Lockerbie probe

Lord Advocate Frank Mulholland said that a four-person team of Scottish police and prosecutors, along with an FBI delegation, met senior Libyan officials in Tripoli on Monday.

The trip was not announced in advance for security reasons.

Mulholland said the discussions "were positive and it is hoped there will be further progress as a result."

The December 1988 bombing of Pan Am flight 103 over the Scottish town killed 259 people aboard the plane and 11 on the ground. Many of the victims were American.

Libyan intelligence officer Abdelbaset al-Megrahi is the only person convicted over the attack. He was released from a Scottish prison in 2009 on compassionate grounds after doctors said he had terminal cancer and would die within months.

He died in May 2012, protesting his innocence.

Some victims' families believe Megrahi, who was convicted in 2001, was not responsible for the bombing, and police suspect others may have been involved.

After the 2011 fall of dictator Moammar Gadhafi, Britain asked Libya's new rulers to help fully investigate the bombing and determine whether other individuals should be prosecuted.