India, July 29 -- The mass shooting at 345 Park Avenue in Midtown Manhattan on Monday night left New York reeling from "a barrage of shots. like an automatic weapon. Like a high-capacity weapon."

Shane Tamura, 27, opened fire inside the Park Avenue Tower office building during the evening rush, killing five people, including a New York City police officer. At least four people were injured in the chaos, per CNN.

The gunman later turned the weapon on himself, dying on the 33rd floor of the skyscraper, which houses tenants such as Blackstone and the NFL.

Photos obtained by The New York Post from the crime scene reveal the weapon used: a Palmetto State Armory AR-15 rifle chambered in .223-caliber. The rifle, which retails for roughly $420...