PESHAWAR: Six security personnel were injured in firing and shelling from Afghan security forces in South Waziristan tribal agency on Wednesday.

Afghan security forces early on Wednesday morning fired mortal shells at a security checkpost in the Angoor Adda area of South Waziristan.

Tensions have been rising along the border of Khyber Agency and South Waziristan tribal region over the last few days, say official security sources.

Reports of rising tensions come as the Taliban step up attacks in Afghanistan as a part of their annual offensive.

An Inter-Services Intelligence officer was accused of involvement in a Taliban attack targeting the Afghan parliament building on June 22.

The latest attack on security personnel occurs as operations Zarb-i-Azb and Khyber II ─ targeting militancy in the sensitive tribal region of Waziristan ─ have reached their final phases.