After stopping drone strikes in Pakistan for the first six months of the year amid peace talks with the Taliban, the U.S. has launched three such strikes in as many days. The latest drone attack, against a suspected Islamic militant training camp, killed six suspected militants and wounded nine others, intelligence sources told Reuters on Tuesday.

The suspected camp, in northwest Pakistan, was hit around noon local time Tuesday in the Shawal area of South Waziristan, on the border with Afghanistan. The area was also hit Sunday and Monday. Five suspected militants were killed in Shawal on Sunday and another five were killed in the area on Monday.

In the latest strike, six militants were killed when three missiles launched from drones hit the suspected camp. Another nine were injured in the attack.

The U.S. had stopped drone strikes while Pakistan tried to negotiate peace talks with the Taliban that fell apart. Drone attacks were launched again in June. The strikes have been a contentious issue in Pakistan. Leaders there state publicly that the attacks violate the country’s sovereignty, although Reuters noted that former Pakistani President Pervez Musharraf admitted to approving strikes during his tenure.