Two suicide bombers have attacked an army camp in northwestern Pakistan, killing at least two soldiers and wounding several others.

Pakistani security officials say the attackers Wednesday drove a vehicle packed with explosives into a gate at the camp in Wana, the main town in the South Waziristan tribal area.

There was no immediate claim of responsibility.

South Waziristan is one of Pakistan's seven federally-administered tribal agencies. The military has launched several offensives in the region targeting al-Qaida- and Taliban-linked militants who have strongholds in the porous border area.

U.S. drone strikes, which are unpopular in Pakistan, also regularly target militants in the region.

Last week, a suicide bombing in Wana wounded Maulvi Nazir, the main militant commander in South Waziristan.