Officials say the dead were militants, but eyewitnesses told the BBC the bombs destroyed the home of a tribal chief, killing three women and four children.
Pakistani troops have been engaged in an major offensive against the Taliban in South Waziristan, further south.
The army believes many insurgents fled from there to areas such as Orakzai.
A number of air strikes have targeted militant targets in Orakzai in recent weeks.
The UN says more than 40,000 civilians have left their homes in Orakzai and are in need of humanitarian assistance.