Arson could be the cause of several wind-driven brush fires that burned on New York’s Long Island over the weekend, injuring two firefighters and sending large smoke plumes into the air, officials said.

The National Weather Service said the weather is cooperating; it is unlikely for fires to spread on Monday, due to calmer weather conditions and a decrease in wind gusts. Suffolk County police are expected to continue an arson investigation into the cause of the fires by using drones and helicopters on Monday.