Milestones

Ten years ago: The first of three massacres by Sikh extremists over two days took place in India as gunmen attacked a bus with Hindu passengers. Seventy-two people were killed in the attacks.

Five years ago: The Group of Seven industrial nations opened their 18th annual economic summit in Munich, Germany.

One year ago: A Delta MD-88 jetliner’s left engine blew apart during an aborted takeoff from Pensacola, Fla., sending metal pieces ripping into the cabin, killing a mother and her son. President Clinton announced the biggest changes in the rules governing meat and poultry safety in 90 years. Steffi Graf won her seventh Wimbledon title, defeating Arantxa Sanchez Vicario 6-3, 7-5.