U.S. President Barack Obama said Thursday the United States has canceled military exercises with Egypt to protest the killing of hundreds of protesters, in his first public statement on the rapid developments in Egypt.

He interrupted his weeklong vacation to address the clashes that have left more than 500 people dead.

When people have a brain injury so severe that they can't squeeze a loved one's hand or otherwise respond, there are few good ways to tell if they have any lingering awareness or are in a vegetative state. Now researchers have created a tool to peek inside the brain and measure varying levels of consciousness.

The work reported Wednesday is highly experimental, not ready for bedside use yet — and if it pans out, a big question is how to use it without raising false hope. No one knows what level of consciousness at a certain point after injury really predicts recovery.

Long-term results from a major U.S. study ease worries about the safety of a hormone-blocking drug that can lower a man's chances of developing prostate cancer.

The drug cut prostate cancer risk by 30 percent without raising the risk of dying of an aggressive form of the disease as earlier results hinted it might.

There are three reasons why Barcelona is favored to defend its Spanish league title.

They are as concise as they are convincing: Lionel Messi, Andres Iniesta and new arrival Neymar.

Just weeks after winning the Wimbledon title, Marion Bartoli retired from tennis on Wednesday, tearfully conceding that the pain from a series of injuries was too much to bear.

"My body was really starting to fall apart and I was able to keep it together, go through the pain — with a lot of pain — throughout this Wimbledon and make it happen," the 28-year-old French player said, tears running down her cheeks. "That was probably the last little bit of something that was left inside me.

Serena Williams overcame what she described as one of her worst sets before beating qualifier Eugenie Bouchard of Canada 4-6, 6-2, 6-2 on Wednesday in her opening match at the Western & Southern Open.

"So it was just some crazy tennis out there," Williams said.

Gonzalo Higuain and Ever Banega scored as Argentina extended its unbeaten record against Italy to four matches with a 2-1 win over the Azzurri, while Brazil was handed a 1-0 loss by Switzerland in another friendly on Wednesday.

Brazil's 11-match unbeaten run came to an end as Dani Alves scored an own goal with a header into the top-left corner.

ABC says "Grey's Anatomy" star Sandra Oh is leaving the medical drama after the coming season.

Shonda Rhimes, the show's creator and executive producer, said she's grateful for what she called the actress' "brilliant" work. Rhimes said "Grey's Anatomy" will savor Oh's character of Dr. Cristina Yang in the upcoming 10th season and give her the exit she deserves.

A large UPS cargo plane crashed Wednesday in an open field just outside an airport in Birmingham, Alabama, killing two crew members aboard.

Birmingham Fire Chief Ivor Brooks said the pilot and co-pilot, the only people on board, were pronounced dead at the scene

A man who claims he was punched and kicked by a member of Chris Brown's entourage during a fight at a recording studio sued the R&B singer on Tuesday for assault and battery.

Sha'keir Duarte sued Brown for unspecified damages in Los Angeles Superior Court, claiming he suffered a concussion as well as humiliation and mental anguish as a result of the attack.