A visit to the US by Pakistan's Prime Minister Nawaz Sharif has ended with no firm commitment to expand bilateral trade and investment between the two countries.

The official visit to Washington last week was hosted by President Obama and intended "to strengthen US-Pakistan relations and advance shared interests in a stable, secure, and prosperous Pakistan and region," a statement said.

But no progress was reported on a possible free trade agreement or expanding the Generalized System of Preferences (GSP) eligibility to include more Pakistani textile and apparel goods - both of which had been mooted as possible discussion points before the talks began.

The two leaders pledged to continue discussions through the strategic dialogue process, and noted that the US-Pakistan Trade and Investment Framework Agreement (TIFA) is the key vehicle to promote US investments in Pakistan.

Senior officials have also been tasked with developing a joint action plan to expand trade and investment flows between the two countries over the next five years and intend to hold the third US-Pakistan Economic Opportunities Conference in the next year.

President Obama also reiterated US support to help Pakistan address its energy shortfall - with Prime Minister Sharif expressing his commitment to expand power generation capacity, promote the efficient use of energy resources, and better utilise Pakistan's domestic natural gas, hydroelectric, and renewable resources.