NYPD cops have been warned to brush up on their firearms tactics after two unarmed civilians were recently shot dead by police, The Post has learned.

A memo went up in precinct houses last week reminding officers to “slow down . . . request backup . . . exercise firearms control [and] formulate a tactical plan” before shooting.

The “tactical awareness bulletin” — which outlines various scenarios in which cops could “inadvertently” or erratically discharge their weapons — was also read during roll call, sources said.

The reminder comes in the wake of the recent fatal police shootings of Queens National Guardsman Noel Polanco, 22, during a traffic stop on the Grand Central Parkway and Bronx bodega worker Raynaldo Cuevas, 20, who collided with a cop while fleeing a robbery.