Transportation authorities are determining what struck a high-speed Amtrak Acela train as it passed through Philadelphia on Sunday night.
Just before 7 p.m., a northbound Acela headed from Washington, D.C., to New York City suffered a cracked window after it was mysteriously struck by an object as the train passed through Philadelphia’s Bridesburg neighborhood, ABC reported.
“There was this giant boom. It almost sounded like this tray table had dropped really hard and strong and loud,” passenger Taylor Lorenz told CBS in a related article. “Immediately everybody looked at it and said, ‘Oh my God, it’s a gunshot. Is that a bullet in there? What’s going on?'”
Images posted on social media showed the damaged window after it had been struck.