U.S. drone kills four al Qaeda members in Yemen: sources SANAA (Reuters) - A U.S. drone killed four suspected al Qaeda militants on Tuesday in a strike on their car in northern Yemen as they drove away from a militant training ground, according to tribal sources and local officials, the fourth such attack in four days. Washington has scaled up action against al Qaeda in Yemen, where the group exploited widespread anti-government unrest in 2011 to seize swathes of territory in the south. The four men were travelling in a vehicle through the desert in the Yemeni province of al-Jawf, near the border with Saudi Arabia, a tribal source told Reuters, declining to be named. The strike targeted a gathering of al Qaeda members who had made the area a center for training. One of the cars was hit and everyone inside was killed ... the others fled," a local official told Reuters, also declining to be identified. Al Qaeda in the Arabian Peninsula (AQAP) is considered by Western governments to be one of the most dangerous arms of the global network founded by Osama bin Laden, and has attempted a number of attacks against U.S. targets. Another four suspected insurgents were killed in a strike in central Yemen on Monday, while six more were killed in drone strikes in Maarib on Saturday and Sunday. But discontent at the drone strikes is growing. Earlier on Tuesday, a Yemeni cabinet minister criticized drones and urged a move to ground operations to avoid hurting civilians. Reporting by Mohammed Ghobari; Writing by Raissa Kasolowsky; Editing by Alison Williams