Islamabad, Pakistan (CNN) -- A suspected U.S. drone strike in Pakistan's tribal region killed 20 suspected militants Tuesday, officials said.
Two Pakistani intelligence officials said the drone fired four missiles -- two at a vehicle and two at a suspected militant compound the vehicle had just left.
The officials asked to not be named because they were not authorized to speak to the media.
The attack happened in the Ghulam Khan area of North Waziristan, one of the seven districts of Pakistan's often ungoverned tribal region. The area is widely believed to be a safe haven for al Qaeda-linked groups fueling the insurgency in Afghanistan.
Based on a count by CNN's Islamabad bureau, Tuesday's suspected drone strike was the 92nd this year, compared to 52 strikes in all of 2009.
Journalist Nasir Habib contributed to this report.