WASHINGTON - The United States plans to give Pakistan about $100 million in humanitarian aid to help people who have fled fighting between government forces and Taliban militants in the Swat Valley, two sources familiar with the plan said on Tuesday.

U.S. Secretary of State Hillary Clinton plans to announce the aid at the White House at 11:15 a.m./(1515 GMT), they said. The White House said Clinton would make an announcement at that time but provided no details on it.

The money would come from existing government resources, meaning the Obama administration would not need to seek special permission from the U.S. Congress to spend it, and was to be disbursed immediately, according to the two sources, who spoke on condition of anonymity.

One of them said the money included disaster aid, refugee aid and food aid.

More than a million people are believed to have been displaced by heavy fighting between Pakistani soldiers and Taliban militants in the Swat Valley. The Pakistani army launched the offensive this month as international alarm grew over an intensifying Taliban insurgency.

(Reporting by Arshad Mohammed and Matt Spetalnick; Editing by Doina Chiacu)