NEW YORK (WABC) -- Investigators on East 80th Street in Canarsie are combing for clues after a 28-year-old man was shot in the face around 4:30 a.m. in an apparent drive-by shooting.
RELATED: Brooklyn man fatally shot in front of apartment, suspect on the run
Meanwhile, around 3 a.m. in Jamaica, Queens, another 28-year-old, this time, an off-duty correction officer, was killed when he was shot in the head and chest. Police sources say the murder of Officer John Jeff was a planned hit after he left a party with a fellow female correction officer.
After Officer Jeff left the party, three cars boxed him in. The suspect got out of the first car, and shot Jeff while he and the woman were in he car. Sources say the suspect then grabbed Jeff's department-issued firearm and used it to shoot him several times, and took off with the gun.
Jeff had only been a correction officer for two years at Rikers Island.
Angeline Simeon knew him.
"He was calm, collected, you know, he minded his business," said Simeon.
At Grand Central Terminal, a 40-year-old man tapped on a victim's shoulder and then shot him while waiting on the platform for a southbound 4 train around 10 a.m.
The victim is in stable condition as investigators try to figure out if the attack was random or targeted.
In the past 24 hours, there have been 20 shootings throughout the city, with 23 victims. Three of those victims have died.
RELATED: 3 injured, 1 critically in shooting at Queens backyard house party
A man was shot in the Soundview section of the Bronx around 8 p.m. Saturday. Not long after, a man was shot in Allerton. Then, a man was shot in Washington Heights on West 188th Street - that victim is not cooperating with police.
In the Belmont section of the Bronx just before 5 p.m., a 20-year-old man was shot in the shoulder and hip. He told police he was sitting outside when two men approached him and opened fire. He is in stable condition, and the gunman fled the scene.
Around the same time in East Harlem on 102nd Street, a 29-year-old man was shot once in the back. He is in stable condition.
Just after 11 p.m. Friday night, at a block party on Malcom X Boulevard and 112th Street, four people were shot - three women and a man. All are expected to survive. No arrests have been made.
In Harlem, on West 128th Street, just before 1 a.m. a 30-year-old was shot and killed.
Three men were shot on Dean Street in Brooklyn, including a 21-year-old shot twice in the back, and a 22-year-old was grazed in his head.
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NYC violence: 3 dead, 23 shot in 20 separate shootings overnight