Filmmaker Details Investigation That Identified Alleged Pan Am Flight 103 Bomb-Maker

Thirty-two years after the bombing of Pan Am Flight 103, new charges have been brought against the man suspected of making the bomb that took down the plane over Lockerbie, Scotland.

U.S. Attorney General William Barr announced Monday that the department was charging former Libyan intelligence officer Abu Agela Mas'ud Kheir Al-Marimi. He is accused of providing a Samsonite suitcase with a Toshiba cassette player that was armed with an explosive.

The charges come after decades of investigations in several countries that led to only one conviction for the attack that killed 270 people. Scottish judges convicted Libyan Abdel Basset Ali al-Megrahi in 2001 for his role in the bombing. He died in 2012.

Filmmaker Ken Dornstein was sure others were involved.

His brother, David, was killed in the bombing, and Dornstein has dedicated his life to searching for the truth. In his 2015 Frontline documentary series "My Brother's Bomber," he revealed links that eventually led to the indictment of Mas'ud as the suspected bomb expert.