A gang of Pakistani militants executed two alleged US spies in front of thousands of cheering supporters Friday as a top UN official expressed fears that peace deals with the gunmen were sparking a wave of human rights abuses. At least 5,000 people gathered by the banks of a stream in the Bajur region to watch the grisly execution, which highlighted the power of local Taliban forces in the lawless tribal areas near the Afghan border. Masked militants pulled the two blindfolded Afghans from a car and forced them to kneel on the ground. Waliur Rehman, a local Taliban commander, told the crowd that the two men confessed to aiding in a suspected US missile strike last month in the border town of Damadola that killed 14 people. The men revealed the names of others involved, and they would be killed as well, he said.