(CNN) -- A drone strike in Pakistan's tribal region killed four militants Tuesday, two Pakistani intelligence officials said.
The incident occurred in the Mirah Shah area of North Waziristan when two missiles were fired at a militant's vehicle.
The United States does not comment on suspected drone strikes. But it is the only country in the region known to have the ability to launch missiles from drones, which are controlled remotely.
This comes a day after a drone strike in South Waziristan killed six alleged militants.
South and North Waziristan are among the seven districts of Pakistan's volatile tribal region bordering Afghanistan. The overwhelming majority of drone strikes have targeted areas in those regions.
Analysts say the areas are havens for militants fueling the insurgencies in Pakistan and Afghanistan.