Five people were shot — one fatally — in separate incidents across the Big Apple Monday and Tuesday, according to the NYPD.

Most recently, an 18-year-old man was blasted in the back of the head inside a building on Frederick Douglass Boulevard near West 155th Street, on the grounds of NYCHA’s Polo Grounds Towers around 12:45 a.m. Tuesday, cops said.

He was taken to Harlem Hospital, where he was pronounced dead.

A person of interest — described as a friend of the victim — was taken into custody, but he claimed that his pal was playing with the gun when he accidentally shot himself, according to police sources.

Police were still probing the case later Tuesday morning and the victim’s name was not released pending family notification.

Earlier in the Bronx, a man was shot during an attempted carjacking just after midnight — but one of the suspects ended up with even more serious injuries when the wounded victim drove off, pinning him to a pole, according to cops.

The 24-year-old driver had pulled over in his 2015 Jeep Cherokee on Fairmount Place near Prospect Avenue in Crotona when a group of three men tried to yank him from the car, police said.

When the victim attempted to drive away, one of the men opened fire, striking him in the right hand and grazing his head.

But the victim kept driving — and ended up crashing into a pole, pinning a second suspect, according to cops.

He was taken to St. Barnabas Hospital in critical condition.

That suspect was not the alleged shooter, though he did have some loose rounds in his pocket, police said.

The gunman and the third suspect took off on foot while the Cherokee driver was also transported to St. Barnabas, where he is listed in stable condition, authorities said.

A day earlier, two people were shot citywide — one in Williamsburg and the other in the Arverne section of Queens — both in the early morning hours.

The victims, both women, suffered non-life-threatening injuries, according to police.

The city has recently seen a surge in shootings.

On Monday’s date in 2019, five people were shot — but that day was a Saturday, on which more gun violence is typically reported.

Shooting incidents have nearly doubled compared to this time last year, and the number of victims has more than doubled, according to NYPD data.