VALHALLA, N.Y. (CBS/AP) — Investigators headed Wednesday to the site of a fiery commuter train crash that killed six people, seeking clues to why the SUV that triggered the wreck was stopped on the tracks.

As a National Transportation Safety Board team headed from Washington to the crash site, local officials worked to identify those killed in the deadliest accident on one of the nation’s busiest commuter rail lines — one that has come under harsh scrutiny over safety after a series of accidents in recent years. Fifteen people remained hospitalized as officials said they were, for now, mystified by the ghastly crash on the Metro-North Railroad.

“It’s really inexplicable, based on the facts we have now,” Gov. Andrew Cuomo said on WCBS-AM radio. “Everybody wants to know exactly what happened, so that if something can be corrected, we correct it.”

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