The New York City Police Department and other law enforcement agencies have been alerted to a new threat raised by the Islamic State terror group. The jihadist entity released a new video on Saturday urging fellow jihadists to “rise up” against the U.S. and other Western states.

ISIS spokesman Abu Mohammed al Adnani told those loyal to the Islamic State to “rise up and kill intelligence officers, police officers, soldiers, and civilians” in the U.S., Canada, France, and Australia. “Do not let the battle pass you by wherever you may be. Strike their police, security, and intelligence members, as well as their treacherous agents,” Adnani added. He suggested that if his holy warriors did not have an explosive device or a firing weapon, they should instead “smash his head with a rock, or slaughter him with a knife, or run him over with your car.”

CNN received an NYPD internal memo that stressed law enforcement should “remain alert and consider tactics at all times while on patrol.”

“Pay attention to people as they approach and look for their hands as they approach you,” reads a memo obtained by the New York Daily News. “At least one officer must stand outside the vehicle at all times. Pay attention to your surroundings,” read an email obtained by the New York Post.

The FBI and DHS (Department of Homeland Security) have released a similar bulletin to federal officials and local law enforcement across America.

In late October, Muslim Zale Thompson attempted to kill four NYPD officers with an axe, and successfully struck one in the head. Officials believe Thompson was radicalized through Islamist social media sites.