NEW YORK (CBSNewYork) — Warm weather and hot tempers led to a series of shootings over the Memorial Day weekend and the violence spilled into the early morning hours of the work week.

“It was a long very good weather weekend and we tend to have spikes in violence associated with the many social gatherings, barbecues, et cetera,” Police Commissioner Bill Bratton said.

In the most recent incident, a man was seriously stabbed at Stanley and Pennsylvania avenues in Brooklyn around 8:30 a.m. Tuesday, 1010 WINS’ Juliet Papa reported.

Around 3 a.m. Tuesday, police said a retired police officer working security at a waste recycling plant was sitting in his car at the intersection of Georgia Avenue and Linden Avenue when he was approached by two armed men who demanded his money and vehicle.

The retired officer got out of the car and fatally shot 18-year-old Manuel Ocampo, WCBS 880’s Peter Haskell reported.

Police are also investigating a shooting that left a 20-year-old man dead in Sunset Park around 2:30 a.m. Tuesday.

On Monday night, two 18-year-old women and a 24-year-old man were injured during a shooting after a party spilled out into the street in Brooklyn, the NYPD said.

All three victims were taken to a hospital with non-life threatening injuries following the shooting, which happened on East 95th Street near Avenue M in Canarsie.

Early Monday morning, a 20-year-old man was killed and a 25-year-old man injured in a shooting at 219th Street and 137th Avenue in Queens.

Around 6 a.m. Sunday, police said a 27-year-old man was killed in a shooting at East 96th Street and Winthrop Street in Brooklyn.

Police are also investigating two separate stabbing incidents on the subway system that left three people injured.

The first incident happened around 3 a.m.

Two suspects, who boarded a southbound Q train at the Atlantic Avenue station, demanded money from a rider and when he refused they stabbed him in the head and stomach, police said.

The suspects fled when the train pulled into the Prospect Park station. A broken knife was recovered in the station.

That victim was taken to the hospital in stable condition.

Then at around 3:30 a.m. in Manhattan, police say two men were stabbed aboard a southbound 4 train at the Lexington Avenue-116th Street station during an argument with two other men. They were both taken to the hospital and are expected to survive.

So far, there have been no arrests in either incident. The investigation is ongoing.

Bratton said homicides and assaults are down this year, but shooting incidents have increased by 10 percent.

Check Out These Other Stories From