A Libyan intelligence operative suspected of making the bomb that blew up Pan Am flight 103 over Lockerbie, Scotland, in 1988, killing 270 people, appeared in a federal court in Washington on Monday, ahead of being formally charged.

Abu Agila Mohammad Mas'ud Kheir Al-Marimi appeared in a U.S. courtroom nearly 34 years after a bomb on board the Boeing 747, which was flying from London to New York City, killed all 259 people on board and 11 on the ground.

Clad in a green jumpsuit, the 71-year-old Mas'ud appeared to walk with a limp and complained of flu symptoms as he clutched a tissue.