Pakistani military said 37 militants were killed today when security forces repulsed an attack on observation post near a fort in the South Waziristan region on the Afghan border.
The military had said earlier the militants had suffered heavy casualties in the attack on the post near the Ladha fort.
It later said in a statement it had determined through communication intercepts and its own sources that 37 militants had been killed.
An earlier report suggested up to five soldiers had been killed.
The militants attacked the Ladha fort and an observation post an hour after midnight yesterday, but the attack was repelled, the military added.
Violence has intensified in recent days in South Waziristan, on the Afghan border, where an al-Qaeda-linked militant leader blamed by Pakistan for the December 27th assassination of opposition leader Benazir Bhutto is based.
Baitullah Mehsud, has been blamed for a string of attacks in recent months.
On Wednesday last week, militants loyal to Mehsud attacked and captured another fort in the region in a serious setback for the military.
Two days later, the military said up to 90 militants were killed in two clashes, including an attack on gunmen gathering to attack Ladha fort.