U.S. drone missile strikes killed at least 15 people on Friday near the city of Peshawar in northwestern Pakistan-Afghan. The drones fired a total of six missiles into three military compounds, according to the Associated Press.

The area, close to the border of Afghanistan, is known for being extremely active with Taliban and al Qaeda operatives. A security official for the U.S. confirmed that 15 people were dead and several were injured, but it was unclear whether they were civilians.

Pakistan's Foreign Ministry spokesman Moazzam Ahmad Khan criticized Friday's strikes.

"We regard these strikes as illegal and unproductive," he said to the AFP, reiterating statements that had been made the day before directly to U.S. officials.

"These attacks also violate our sovereignty, territorial integrity and are in contravention of international laws."