An unoccupied school bus parked in a lot near the Long Island Rail Road tracks in Valley Stream exploded into flames Wednesday morning.

Nassau County police responded to the scene, a lot near Cornwell Avenue and East Merrick Road, just southwest of the Westwood train station, after taking a call at 7:09 a.m., a police spokesman said.

Yesterday evening, a Nassau police spokesman said the department's investigation of the incident was ongoing and could not provide additional details.

An LIRR spokeswoman said the fire has had no immediate effect on trains. One train already had passed the fire location, Marjorie Anders said.

Track inspectors were dispatched to the scene, she said, as a precautionary measure.

A spokeswoman for Veterans Transportation, the Valley Stream company that owns the bus, said no one was injured and confirmed the bus was parked and unoccupied when it either caught fire or exploded.

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The woman, who declined to provide her name, said she had no additional details and that the company is awaiting an investigation by fire officials.

-- Gary Dymski, Alfonso Castillo and Nicole Fuller