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With U.S. visas in hand, they flew into San Francisco for an alumni reunion in Silicon Valley. But for reasons that are not clear, customs officials revoked many of the visas.

With the Israeli bombardment of Lebanon now in its ninth day, Israel is again warning the occupants of towns and cities in the southern part of the country to leave. Tyre has been the scene of some of the fiercest Israeli air strikes.

This weekend, more than 2,200 riders are expected to arrive in Los Angeles to end a week-long, 585 mile bicycle ride from San Francisco to raise money for AIDS research. Performer and writer Tamara Bick did the AIDS/LifeCycle a couple of years ago, and says it's not just the hills that make it an up-and-down experience -- there are constant reminders of personal struggles with the disease.

U.S. troops in Baghdad are expanding operations, with Iraqi soldiers and police trying to bring security to some of the capital's most dangerous districts. Among the U.S. units involved is the Tomahawks Battalion of the 172nd Stryker Brigade Combat Team, based in Alaska. The Strykers are part of the front line, getting tips, clearing houses, and working neighborhood by neighborhood to bring the city under control.

A new analysis suggests that asthma medications containing the drug salmeterol can increase the risk of hospitalization for any form of asthma. The research, published in the Annals of Internal Medicine revives the debate whether these medications should stay on the market.

John Lasseter's latest film combines the two loves of his life: cartoons and cars. The animation guru behind such hits as A Bug's Life and Toy Story talks to Michele Norris about the trip that inspired his latest movie, Cars.

A U.S. military strike has killed the most feared terrorist in Iraq, Abu Musab al-Zarqawi. The Jordanian-born Zarqawi was killed when U.S. warplanes dropped 500-pound bombs on his hiding place. Pentagon officials say they found a treasure trove of material at the safehouse.

The U.S. is using its presidency of the UN Security Council to focus on food security, as much of the world worries about the ripple effects from the war in Ukraine.

Israel's Security Cabinet approves a wider ground offensive in south Lebanon, authorizing troops to push to the Litani River some 18 miles into Lebanon. Israel says the operation should last about 30 days. Currently, 10,000 soldiers are fighting Hezbollah in a narrow band of Lebanese territory that is about four miles deep.

What's it like to try to survive 120-degree heat, without air conditioning? Here's how people are coping in the heart of Delhi.