Islamabad: The US has reassured Pakistan of an 'early conclusion' of the investigation into the NATO air strike on two Pakistan Army border posts which killed 24 Pakistani soldiers, the foreign ministry said here.US Ambassador to Islamabad Cameron Munter on Friday called on Foreign Minister Hina Rabbani Khar and discussed the current status of bilateral relations between the two countries.

Khar said relations between the two countries must be based on mutual respect. “The recent incidents have led to a re-evaluation of our terms of engagement,” she told Munter.

“The US ambassador assured the foreign minister of an early conclusion of the investigation into the tragic incident on November 26 and to work together with the government of Pakistan to normalise the relationship at the earliest,” the statement said.

The NATO strike in Pakistan's Mohmand Agency near the Afghan border caused a rift between Washington and Islamabad. Pakistan ordered the US to vacate the Shamsi air base in Balochistan province and cut NATO supply lines through its territory to Afghanistan.