President Barack Obama warned Libya's leaders that the US and its Nato allies are still considering military options in response to what he called "unacceptable" violence perpetrated by supporters of Moammar Gadhafi.
"I want to send a very clear message to those who are around Colonel Gadhafi. 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 on Monday.
Libyan warplanes launched multiple airstrikes on Monday on opposition fighters in the second day of a harsh government crackdown to thwart rebels advancing on Gadhafi's stronghold in Tripoli.
White House spokesman Jay Carney said a military response was no more likely on Monday than it was before the surge in violence. He said the US 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 US 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 US is using diplomatic channels, as well as contacts in the business community and nongovernmental organisations, to gather information about the opposition.
Obama said he has also authorised $US15 million in humanitarian aid to help international and non-governmental organisations 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 US and United Nations have imposed sanctions on Gadhafi's regime, and US military forces have also moved closer to Libya's shores to back up demands that Gadhafi step down.
Obama spoke alongside Australian Prime Minister Julia Gillard, who is in Washington for meetings.
