Witnesses recount panic during Shane Tamura’s deadly rampage inside NYC skyscraper

Witnesses to the deadly shooting at 345 Park Avenue were in disbelief when they saw gunman Shane Tamura open fire — and some were left barely controlling their panic.

“I was on the one block away, and I heard shots being fired and then a bunch of police, they came to neutralize it,” said 30-year-old Oleksandr Stupak, who was standing across from the skyscraper when the bullets started flying Monday evening.

“I went to the Citizen app, and it says active shooting. A lot of police started to come. I mean. [It’s ] crazy,” he told The Post.

Another man — who was apparently in the tower’s lobby when 27-year-old gunman Shane Tamura walked in and started firing — was left gasping for breath on a neighboring office building’s stoop as he called a loved one to tell them what happened.

“I was at work, and this guy came in with an assault rifle and started shooting. I was in the lobby at work,” the man said into the phone.

He buried his face in his hands as he gasped for breath, and had a bandage on his knee and on a hand as a police officer tended to him.