WASHINGTON - (AP) - The Obama administration is freezing assetsheld by Libyan leader Moammar Gadhafi and four of his children inthe United States. The Treasury Department says the sanctions against Gadhafi,three of his sons and a daughter also apply to the Libyangovernment. The action was taken under an executive order signed Friday byPresident Barack Obama. Obama says the U.S. is imposing unilateral sanctions on Libyabecause continued violence there poses an "unusual andextraordinary threat" to America's national security and foreignpolicy. The president acted after hundreds of Americans were safelyevacuated from Libya following days of bloodshed across thecountry. Militias loyal to Gadhafi have been firing on protesterswho have been demanding the Libyan leader's ouster.