WASHINGTON - The Obama administration is laying out a new multiyear, multibillion-dollar military aid package for Pakistan as it presses the Islamabad government to step up the fight against extremists there and in neighboring Afghanistan, US officials say.

Secretary of State Hillary Rodham Clinton and Pakistani Foreign Minister Shah Mahmood Qureshi were to unveil the plan Friday at the end of the latest round of high-level US-Pakistani strategic talks here, the officials said.

The money will be provided over the next five years under the State Department's Foreign Military Financing program that funds other countries' purchases of US-made arms, ammunition and accessories, the officials said. Precise details of what Pakistan will receive under the program were still being determined, they said.

The officials would speak only on condition of anonymity ahead of the announcement, which the administration hoped would reassure Pakistan of the long-term US commitment to Pakistan's military needs and help it bolster its efforts to go after Taliban and al-Qaida affiliates on its territory.