July 30, 2025 4:04 AM GMT+6 Updated 5 hours ago A man holding a rifle walks into an office building at 345 Park Avenue shortly before a shooting that killed several people, in the Midtown Manhattan district of New York City, U.S. July 28, 2025, in a still image taken from surveillance video. Surveillance Camera/Handout via REUTERS WASHINGTON/NEW YORK , July 29 (Reuters) - Cameras at 345 Park Avenue flagged an approaching gunman on Monday as a potential threat that required immediate attention, seconds before he burst into the office skyscraper's lobby and began firing , according to two former federal officials familiar with New York building security systems. A still frame of CCTV footage obtained by Reuters and timestamped 6:26:52 p.m . ET – just over a minute before police received the first emergency call about the mass shooting - shows a man holding an assault-style rifle at his side. A computer-generated bright yellow box around him in the image indicates the use o...