The United States and its allies will likely ramp up airstrikes against ISIS targets in Iraq and Syria after a two-month lull, the head of US Air Forces Central Command said Saturday.

The reduction in airstrikes was because of bad weather and reduced activity on the ground — not due to the start of Russian airstrikes in the region, Lt. Gen. Charles Brown said at the Dubai International Air Chiefs Conference, Reuters reported.

Brown said government forces and insurgents have been increasing their ground movements.

“If they’re not out and about, it’s harder to strike,” he said.