(CNN) -- At least eight members of Pakistani security forces were killed Thursday in an ambush near the Afghan border, officials said.
The bombing attack on a convoy in Pakistan's restive North Waziristan Agency left several others injured, according to the army's public relations arm. Other government sources say that as many 12 people were killed.
It drew a strong condemnation from Pakistani Prime Minister Nawaz Sharif.
In other violence, fresh clashes between the rival Taliban groups Sheryaz Mehsud and Khan Said, also known as Sajna, have left at least 10 militants dead. The fighting broke out in the Shawal area of North Wazirstan early Thursday morning, security sources said.
In Quetta, a bombing killed two people and injured at least 10 others, police said. The victims were civilians, but the bomb -- planted in a motorcycle -- was believed to be targeting a security forces convoy, police said.
Journalist Zaher Shah in Peshawar and CNN's Aliza Kassim in Atlanta reported and wrote. Journalist Syed Ali Shah in Quetta contributed to this report.