Threats have been made to disrupt New Years celebrations in many cities.
Recently there was an ambush attempt in LA. Even though the perpetrators and the motive have not been identified, the incident has many similarities to the NYPD ambush.
LAPD ambush: Police call off massive search for second gunman
Quote :The search for a second shooter in an attack on Los Angeles police was called off early Monday, and red and yellow caution tape barred entrance to the scene of the shooting.
"We don't know what precipitated the shooting," LAPD Lt. Andy Neiman told the Los Angeles Times, but "everyone's keenly aware of what happened in New York," and there is a "sense of uneasiness."
Sunday night around 9:20 p.m., two officers in a single patrol car were responding to a call and driving southbound on Hoover Street near 62nd Place. They saw a muzzle flash -- the visible blast from a gun -- and determined they were being fired at, Neiman said.
Despite the surprise attack, neither officer was hurt and they were able to return fire, officials said.
Police called a citywide tactical alert and launched a massive search following what they described as an ambush. One person of interest was detained for questioning, but another man remained at large.
"It was an ambush," Deputy Chief Bob Green said. "They were fired upon without any prior contact with the suspects."
Neiman said, "It's very clear that the officers were in a black and white police car. The people who shot at these officers knew they were the police."