At least seven security personnel have been killed and five injured after gunmen opened fire on an army campsite in central Pakistan, officials say.

巴基斯坦中部一座兵营遭歹徒袭击，至少七名安保人员死亡、五人受伤。

The attack happened at a site along the Chenab river in the Gujrat district of central Punjab province.

The camp had been set up to search for the body of an army pilot whose helicopter crashed in May.

Security targets in Pakistan's north-west are frequently hit, but analysts¹ say attacks in this area are unusual.

No group has said it carried out the attack as yet.

"The exact number of attackers is not known but they came by motorbike and sprayed bullets on the troops from the bridge," a senior security official told the AFP news agency on condition of anonymity².