Twenty-five years ago, Pan Am 103, a New York-bound flight from London, exploded over Lockerbie, Scotland, killing all 259 people aboard the plane, and 11 others on the ground.

Memorial services were held Saturday in the United States, Scotland and England as families remembered the terror attack's victims. Many of the dead were American college students flying home for Christmas.

Bagpipes sounded and wreaths were laid in the Scottish town of Lockerbie and mourners gathered for a moment of silence at London's Westminster Abbey. U.S. Attorney General Eric Holder told victims' relatives at Arlington National Cemetery that they should take comfort in their unity even if time cannot erase their loss.

Here's a collection of images from that catastrophic day in 1988 and from this weekend's services.

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