An arson investigation is underway on Long Island after a series of brush fires over the weekend injured at least two firefighters as flames consumed hundreds of acres in Suffolk County.

All four Long Island brush fires that sent soaring plumes of smoke into the air had been contained by Sunday afternoon, authorities said. Two firefighters were hurt battling the blazes and two commercial buildings were damaged, Newsday reported. No residential buildings were damaged; any earlier reports of burned homes were erroneous.