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 / Updated  / Source: NBC News

The FBI has found no damage on the windshield or engine of the Amtrak train that derailed in Philadelphia that could have been caused by a firearm, investigators said Monday.

The National Transportation Safety Board said evidence does not suggest that the doomed train was struck by a bullet, but investigators haven't ruled out that the locomotive might have been hit by another object before derailing Tuesday.

An assistant conductor on board Amtrak 188 told NTSB investigators Friday that she thought she heard the engineer, Brandon Bostian, say the train had been struck by something shortly before the derailment. And two other trains traveling in the same area at the same time might have also been hit by objects, according to passengers.

Bostian has told the NTSB he doesn't remember what happened before the crash, and NTSB lead investigator Robert Sumwalt said Sunday that Bostian didn't say anything to dispatchers about something hitting the train, according to tapes and dispatchers' accounts.

Sumwalt said on CNN Sunday that the train's windshield did have a mark that investigators were looking into. The NTSB said updates on the investigation would be available later in the week, but a conclusion could take up to a year.

Before the derailment, which left eight people dead and about 200 injured, the train accelerated to 106 mph, more than double the 50 mph speed limit of the curve where it ultimately skipped the tracks.

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