At least 10 Pakistani troops died in a clash and an airstrike on the Afghan border, Pakistani military officials said Wednesday. The clash broke out late Tuesday after Pakistani tribesmen and security forces reportedly tried to stop security forces from Afghanistan from setting up a mountaintop post in a disputed border region. Local tribesman Damagh Khan Mohmand, who witnessed the fighting, said it lasted for four hours. He said Afghan and foreign forces traded fire with both Pakistani tribesmen and troops. It was not clear if the tribesmen involved in the fighting were associated with pro-Taliban militants who are active in Pakistan's lawless tribal regions. The nationality of the foreign forces allegedly working with the Afghan troops was also not known.