Sentence Correction

"Militants seeking independence for Croatia have struck inside the U.S. in the past. In December 1975 Croatian nationalists were suspected of planting a bomb in a luggage locker at La Guardia Airport, killing 11 people and injuring 75. Less than a year later, Croats hijacked a TWA jet traveling from New York City to Chicago and eventually diverted it to Paris. As part of that operation, the group also planted a bomb at Grand Central Terminal, which killed a police officer who tried to defuse it. In June 1980 Croatian "freedom fighters" detonated a bomb inside the museum at the Statue of Liberty, but no one was injured."

Does which refer to Bomb or Terminal ?

"Most of the Balkan nationalities have a history of marrying politics with violence. It was the murder of Archduke Francis Ferdinand and his wife in Sarajevo by a Serbian youth that set off World War I. And according to a French expert on the Balkans, Xavier Raufer, the terrorist techniques that the Palestinians and the Lebanese made notorious in the past two decades -- bombings, kidnappings, hijackings -- were virtually invented by Balkan groups. "These guys make Abu Nidal look like Mother Teresa," he says."

Is THAT used correctly ?