Pakistan has buried 24 of its troops who were killed in a Nato airstrike at a checkpoint on the Afghan border.
Army chief General Ashfaq Pervez Kayani led mourners in funeral prayers at military headquarters in the north-western city of Peshawar.
The incident on Saturday has heightened already tense relations between Pakistan and the US and Nato.
Nato has apologised, calling it a “tragic unintended incident”, and is investigating what happened.
Nato chief Anders Fogh Rasmussen said he had written to Pakistan’s Prime Minister Yousuf Raza Gilani to “make it clear that the deaths of Pakistani personnel are as unacceptable and deplorable as the deaths of Afghan and international personnel”.