The NYPD mapped out behind closed doors its plan for a coordinated attack on the Big Apple with multiple "active shooters," suicide bombers, and terrorists holding innocent people hostage Monday, reports the New York Post.

Police brass practiced their response to four simultaneous assaults on iconic, heavily trafficked locations in the city during a daylong exercise at 1 Police Plaza.

Commissioner Bill Bratton said the planning was needed because terrorists "would love to do it here."

"What if we had four simultaneous attacks? Would we be ready? That's why we did this exercise today," he told reporters.