Obama considering military action against Libya

President Barack Obama warned Libya's leaders that the U.S. and its NATO allies are still considering military options in response to what he called "unacceptable" violence perpetrated by supporters of Moammar Qaddafi.

"I want to send a very clear message to those who are around Colonel Qaddafi. It is their choice to make how they operate moving forward. And they will be held accountable for whatever violence continues to take place," Obama said during remarks in the Oval Office Monday.

Libyan warplanes launched multiple airstrikes Monday on opposition fighters in the second day of a harsh government crackdown to thwart rebels advancing on Qaddafi's stronghold in Tripoli.

White House spokesman Jay Carney said a military response was no more likely Monday than it was before the surge in violence. He said the U.S. and its partners are considering a wide variety of military actions, including a no-fly zone, but said deploying ground troops "is not top of the list at this point."

Carney said the U.S. also is considering providing weapons to rebel forces, although he cautioned that there remain many unanswered questions about what groups comprise those forces. He said the U.S. is using diplomatic channels, as well as contacts in the business community and nongovernmental organizations, to gather information about the opposition.

Obama said he has also authorized $15 million in humanitarian aid to help international and nongovernmental organizations help and evacuate people fleeing the violence in Libya. More than 200,000 people have fled the country, mostly foreign workers, creating a humanitarian crisis across the border with Tunisia, another North African country in turmoil after an uprising in January that ousted its longtime leader.

Hundreds if not thousands of people have died since Libya's uprising began, although tight restrictions on media make it nearly impossible to get an accurate tally.

The U.S. and United Nations have imposed sanctions on Qaddafi's regime, and U.S. military forces have also moved closer to Libya's shores to back up demands that Qaddafi step down.

Obama spoke alongside Australian Prime Minister Julia Gillard, who is in Washington for meetings.