SAN FRANCISCO (CBS SF) — A car that was spotted last month during what San Francisco police called “an illegal exhibition of speed event” that included a person waving what looked like an AK-47 rifle out of a window was seized Wednesday, authorities said.

The information came from a Twitter post by the San Francisco Traffic Safety account. The post said that the passenger was seen leaning out of the window of a Cadillac with the weapon in the area of Barneveld and McKinnon on July 11.

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Police said that officers with the department’s traffic division were able to investigate the case and identify the vehicle.

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While the post did not state whether anyone had been arrested, it did say the vehicle in question was seized and impounded on Wednesday.