The white supremacist attacker who slaughtered at least 49 people at two New Zealand mosques Friday was “borrowing from the ISIS playbook,” police brass said.

“What I see is a lot of similarities to, in terms of tactics, you can see that the neo-fascist groups, white supremacists, are borrowing from the ISIS playbook,” NYPD Deputy Commissioner of Counterterrorism and Intelligence John Miller said Friday on “CBS This Morning.”

The suspected gunman, Brenton Tarrant, livestreamed the attack on Facebook in a horrifying 17-minute video — an ISIS tactic that the NYPD often calls “dying live,” he said.

“This was an ISIS tactic where they said, ‘If you’re going to do a mass-casualty attack, you should livestream it over social media,'” he continued.

He added that neo-fascist groups and white supremacists have been increasingly adopting tactics featured in ISIS and al Qaeda magazines.

Later in the day, Miller spoke to worshipers and officers at the Upper East Side’s Islamic Cultural Center, one of the largest centers of its kind in the city, where he said 5,000 worshipers would be attending 1 o’clock prayers.

“Precinct commanders [have] dedicated house of worship cars to check in with all the churches and temples and mosques as part of their daily routine,” he said. “Counterterrorism resources, resources from the Strategic Response Group, the Emergency Service Unit, the Hercules Team — and of course mosques and masjids will be a special focus today and for the next few days until we understand the breadth of, the details of the attack.”