Obama calls Pakistan leader about NATO airstrikes

Washington: US President Barack Obama has told Pakistan's President that the NATO airstrikes that killed 24 Pakistani soldiers were not deliberate attacks and that America is committed to a full investigation.

The strikes along the border with Afghanistan last weekend have further strained ties between the US and Pakistan as the Obama administration tries to wind down the war in Afghanistan.

The White House says Obama and Pakistan's President, Asif Ali Zardari, reaffirmed their countries' relationship and agreed to keep in close touch.

Obama called Zardari on Sunday.