The son of Tehreek-e-Taliban Pakistan chief Mullah Fazlullah was among the 20 militants killed in a drone strike by the United States in Afghanistan on Wednesday morning, Dawn reported. The Taliban said six militants were injured in the attack.

The drone had fired two missiles at a militant facility in Afghanistan’s Kunar province, two unidentified Pakistani intelligence officials told AP. Mullah Fazlullah, who is believed to be hiding in Afghanistan, was not at the location at the time.

A local commander of the Pakistani Taliban, Gul Mohammad, and another who trained suicide bombers, Ustad Yaseen, were among those killed in the attack. The terrorist group blamed Afghan intelligence agencies for tipping off the US about the presence of militants in the region. Most of those who died belong to Pakistan’s Swat district.

The US has not commented on the reports yet.