At least three Pakistan Air Force (PAF) personnel were injured on Monday when suspected pro-Taliban militants attacked their bus in the North Western city of Peshawar.
Witnesses said unidentified men threw a hand grenade at the bus packed with the PAF officers and members of their families, who were coming to Peshawar for duties from their residential area.
The men fled after they lobbed the grenade, they said.
However, police said that a bomb was planted near the road and was exploded through a remote control, smashing few windows of the bus.
Attacks on security men have increased in north west frontier province after the last month's military operation against Islamabad's Lal masjid.
Meanwhile, one soldier died and several hundred others were rushed to hospitals today after cholera broke out in a military camp near Miranshah, the headquarters of the North Waziristan tribal agency.
The soldiers were rushed to the hospitals by helicopters after cholera broke out in their military following contamination of the water, Dawnnews TV reported.
A large number of soldiers have been deployed in the Waziristan to establish the writ of the state following a spate of attacks by pro-Taliban militants in recent months.