WASHINGTON (August 9, 2012)--Washington musician Seth Horvitz, 38, ordered a flat-screen TV from Amazon.com so he was understandably shocked when he received a semiautomatic assault rifle instead.

Horvitz said he purchased the 39-inch television from a third-party seller.

A box arrived from UPS on Tuesday evening, and although it seemed too small to contain the TV he says he initially thought it contained accessories.

But when he opened it, he found a Sig Sauer military-style rifle.

An invoice showed that the gun was intended for delivery to a firearms dealer in Duncansville, Pa.

Horvitz called police and officers took the gun.

They’re now investigating how the mistaken shipment occurred.

Amazon and UPS had no immediate comment.