The NYPD believes the man that who stabbed a six-year-old boy to death in Brooklyn Sunday evening also killed an 18-year-old woman in the same area Friday night.

"We have deployed additional officers into that area for the children who walk to and from the various schools . . . and we will continue doing that going forward," NYPD Commissioner Bill Bratton said at a press conference Monday evening, according to the New York Post. "It would be advisable to be extra cautious."

Friday night, Tanaya Grant-Copeland, 18, was stabbed 32 times in her back and abdomen and left on a street in East New York. A taxi driver found her and drove her to a nearby hospital, where she died.

Two days later, just four blocks away, Prince Joshua Avitto, 6, and Mikayla Capers, 7, were repeatedly stabbed in an elevator. Avitto later died, and Capers remains in critical condition with a collapsed lung.

Police say the same knives were used in both attacks. The knife model, the Dura Edge by Imperial Knife, has not been manufactured since 2004, according to the NYPD.

"The knives were similar in the sense that they were both kitchen-type slicing knifes and had similar-looking black plastic handles and long blades," said NYPD spokesman Stephen Davis.

Police described the suspect as a man around 25 to 35 years old, about six-feet tall, with a heavy build. He was last seen wearing a grey sweatshirt.