The United Nations is urging the Syrian government to let humanitarian relief workers into the country.
U.N. humanitarian chief Valerie Amos traveled to Syria Wednesday to urge both sides to allow aid workers "unhindered access" into the hardest hit areas to evacuate the wounded and deliver essential supplies.
The visit comes as Syrian President Bashar al-Assad continues to defy international pressure to stop the government's violent crackdown.
Sen. John McCain, R-Ariz., said it's time for the United States to act, but military leaders say that's risky because opposition groups could be aligned with al Qaeda or other terrorist groups.
On Capitol Hill Tuesday, McCain urged top military officials to figure out the logistics.
"I would hope, I would hope we would spend some time with your unique capabilities finding out who these people are," he said. "I'm surprised you haven't tried to do that before."
"You should do it because this conflict is going to go on and a whole lot of people are going to die if we allow the status quo to prevail and the slaughter to continue because quote, 'We don't know who they are,'" McCain said.
The U.N. said more than 7,500 people have been killed since the uprising started more than a year ago, while activists put the death toll at more than 8,000.