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The astronauts of the shuttle Discovery spent the third day of their mission moving tons of cargo into the International Space Station. They docked at the station after putting the shuttle through a back-flip. But the astronauts say they first had to overcome a snag: a bad thermostat on a thruster.

A doctor and two nurses were arrested overnight in New Orleans, where they are charged with second-degree murder in connection with patient deaths at a city hospital. The deaths occurred in the chaotic days after Hurricane Katrina.

A national heat wave has Americans dripping in sweat from San Diego to Boston and the strain on the electrical grid is causing power outages. Record amounts of electricity are being used today, and air quality in some regions is reaching unhealthy levels.

Members of Congress hope to block a deal that would place control of several U.S. ports in foreign hands. Dubai Ports World has agreed to buy a company that operates six major seaports. Federal officials insist the purchase does not pose a security risk.

Marine Gen. Michael Hagee is on his way to Iraq to talk to his troops about using lethal force "only when justified." The trip comes amid allegations that Marines killed unarmed Iraqi civilians in two separate incidents. The military has opened investigations into the deaths.

Iraqi police have found at least 85 bodies, killed execution-style, in a Shiite neighborhood in the Sadr City area of Baghdad. Host Alex Chadwick discusses the mass execution and ongoing Shiite-Sunni Muslim sectarian violence in Iraq with New York Times reporter Ed Wong, reporting from Baghdad.

Florida has suffered a rash of alligator attacks in the past week. A jogger was killed last week in Fort Lauderdale, and two other women were killed in two separate alligator attacks this weekend. Melissa Block talks with Nick Wiley, director of the Hunting and Game Division of the Florida Fish and Wildlife Commission.

Israeli forces block Lebanon's ports and put its international airport out of commission, while extending a search for two captured Israeli soldiers near the border. The conflict has sparked two days of heavy fighting between Israel and Hezbollah guerrillas in southern Lebanon.

Senate leaders from both parties agree on a plan that should allow a long-delayed immigration bill to proceed. But the fate of the underlying legislation, which would strengthen the borders but provide a path to citizenship for some illegal immigrants, must still be determined in the Senate next week.

The nation's largest phone companies -- AT&T, Verizon and BellSouth -- reportedly have been providing the National Security Agency with call records of millions of Americans. The agency says it is not listening to the calls, only using them to form a database to detect potential terrorist activity.