The fatal shooting of a 16-year-old boy by undercover police sparked a protest in New York City on Monday night.

Kimani Gray was killed in the East Flatbush area of Brooklyn on Saturday, NBCNewYork.com reported.

On Monday, a protest and candlelight vigil for Gray turned “disorderly,” according to police. A store was “ransacked” and one person was arrested.

Police say Gray was approached by two officers on Saturday because he was acting suspiciously, NBCNewYork.com reported. According to police, the officers identified themselves and only fired at Gray after he raised a .38 revolver.

However, one witness at the scene told NBCNewYork.com that he heard no warning being given.

Gray had previously been arrested four times for charges including grand larceny, according to NBCNewYork.com.

NYPD Sgt. John Buthorn said early Tuesday that there had been a “scheduled protest” at about 8:30 p.m. ET.

“They were going from one location to another and it got disorderly,” he said. “One commercial establishment was vandalized … ransacked … several items were stolen and thrown."

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Buthorn said one person was arrested because disorderly conduct. “He was refusing to leave a location,” after he was asked to do so, the officer said.

A Facebook page called Justice For Kimani Gray has been set up and it had 276 followers at 5:40 a.m. ET on Tuesday.

It showed several photographs of the vigil. One picture showed a crowd of people on the street watched by at least two uniformed officers.