(Newser) – New charges are expected to be unsealed in coming days in connection to the 1988 bombing of Pan Am flight 103 over Lockerbie, Scotland, the New York Times reports. US prosecutors are expected to seek the extradition of Abu Agila Mohammad Masud, a Libyan suspected of making the explosive that brought down the plane, killing 270 people, including 190 Americans, Justice Department officials tell the Wall Street Journal. Masud is reportedly being held by authorities in Libya. An investigation by journalist Ken Dornstein, whose brother died in the attack, helped identify Masud as a suspect in the attack, per the Times. Decades ago, two suspects—both Libyan intelligence officials—were tried in connection to the bombing.