The UN High Commissioner for Refugees says it is grateful for the donation from the Jolie-Pitt Foundation.

It said Thursday the money will go to alleviating suffering caused by the 'most challenging humanitarian crisis of the past decade.'

UNHCR says over 2 million Pakistanis have been driven from their homes this year by fighting between government troops and Taliban militants in the northwest of the country.

Jolie has visited refugees in Pakistan on three missions since becoming goodwill ambassador for the agency in 2001.

The Oscar-winning actress took Pitt with her on one such visit in 2005. -- AP