Gunmen on a motorcycle opened fire at a Pakistani military vehicle in the capital, Islamabad, on Thursday, killing two soldiers, police said, Reuters reported.
It was not clear who was responsible for the attack but it came as the country was on high alert amid fears of retaliatory strikes by militants as the army attacks their stronghold in South Waziristan on the Afghan border.
"Witnesses have told us two men came on a motorcycle and opened fire," said city police official Abdul Qadir.
Pakistani forces launched an offensive on Saturday to wrest control of the lawless South Waziristan region after militants rocked the country with a string of bomb and suicide attacks, killing more than 150 people.