The Westhampton brush fire that burned 400 acres of dry woodland forest and sparked a massive statewide response in eastern Suffolk County on Saturday has been fully knocked down, while arson investigators have launched a probe into the cause of the blaze.

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.

Massive, wind-whipped brush fires are raging across parts of Long Island's Pine Barrens region on Saturday. The risk is getting bigger and bigger. An earthquake with a magnitude of 4.1 rattled the Los Angeles area early Sunday afternoon.

The Suffolk County police arson squad is investigating the fire, according to Mike Martino, a spokesman for Suffolk Supervisor Ed Romaine. Suffolk police Romain's office could not immediately provide details on what initiated the arson probe or whether all the brush fires resulted from the arson.