AN active shooter unleashed chaos in broad daylight in the heart of Manhattan, leaving a police officer and a civilian fighting for their lives.

Gunfire erupted in a luxurious skyscraper located on East 52nd Street between Park Avenue and Lexington Avenue on Monday, a place that houses corporate titans like Blackstone and the NFL.

A frenzied gunman, wearing a bulletproof vest and wielding an assault rifle, stormed into the building and subsequently barricaded himself inside, according to law enforcement sources who spoke to the New York Post.

Videos shared online showed heavily armed NYPD officers in protective gear swarming the building with their weapons drawn.

In footage captured by Fox 5, officers were seen carrying a bloodied victim while others tended to a person lying on the ground outside.

At least one police officer was shot in a shootout with the gunman and is in critical condition, senior law enforcement officials told NBC News.

Another civilian was also shot and remains in critical condition.