Islamabad, Pakistan (CNN) -- A drone attack targeting a suspected militant compound killed two people and wounded three others in Pakistan's northwest Wednesday, officials said.
The attack took place in Tabbi Took Kil, a village near the city of Miranshah in North Waziristan.
North Waziristan is one of seven districts in Pakistan's tribal region along the Afghan border.
On Sunday, another attack in Miranshah killed six suspected militants.
The United States is the only country in the region known to have the ability to launch missiles from drones, which are controlled remotely.
U.S. officials normally do not comment on suspected drone strikes, which have caused tension between Pakistan and the United States in the past.
The attacks have picked up since seven Americans were killed in a December 30 suicide attack at a CIA base in eastern Afghanistan.
There were 45 such attacks during President George W. Bush's two terms, said Peter Bergen, a fellow at the New America Foundation, a public policy institute.
Since President Barack Obama took office, more than 64 attacks have taken place, a study by the foundation said.
Bergen cannot say definitively why the drone attacks have increased, but he cites a revenge factor, saying that U.S. forces are upset and want retribution for the brazen bombing and have cranked up strikes on military targets in the tribal regions of Pakistan.
The attack in December killed seven CIA officers and contractors and a Jordanian intelligence official at Forward Operating Base Chapman.
CNN's Reza Sayah and journalists Nasir Dawar and Nazar ul Islam contributed to this report.