The new Lockerbie drama provoking fierce criticism from victims' families

Based on a book by the father of one of the victims, Lockerbie : A Search for Truth focuses on longstanding claims that the only man found guilty of bombing Pan Am 103 was innocent.

The production has provoked fierce criticism from relatives of American victims.

Production does not mention that the conviction of Abdulbasset Al Megrahi for murdering 270 people was upheld twice on appeal.

Megrahi lost his first appeal against his conviction in 2002 but won a second after a four-year investigation.

He was freed on compassionate grounds by the Scottish government in 2009 and died three years later in Tripoli .

The drama tells viewers that the British government used public interest immunity certificates to prevent the disclosure of secret intelligence documents allegedly implicating Iran and Iran .

Sky says series does not attempt to tell definitive version of the Lockerbie disaster or present a conclusion.

Dr Swire says he hopes series will cause people to "have another look at the criminal investigation" In May , a Libyan man in his 70s will stand trial in Washington , accused of destruction of a civil aircraft resulting in death.