Mayor and his sister do some crimefighting

Mayor Adams’ sister heard something about a shooting, so she said something — to her brother the mayor, who told her to call 911.

The mayoral sibling did just that, and then Adams himself followed up with a 911 call of his own, police and City Hall sources said Monday.

The NYPD responded to Pier 79 near W. 39th St. and 12th Ave. in Hell’s Kitchen about 3 p.m. on Sunday. There was no immediate arrest, but detectives are still investigating the incident.

Adams, who was on his way to pick his sister up, said she called him when she saw a trio of suspects overdressed on what was a warm day.

“While she was waiting, three men walked on with hoodies on — and yesterday was very hot and they had hoodies on and she overheard one of them say something to the tune of, ‘Don’t shoot until you get inside,’ ” Adams said.

“She called me. I said, ‘Immediately call 911.’ And I got on the phone and called 911 to make sure they got the call.”

The mayor, speaking at a Monday news conference to discuss how the NYPD is combating gun violence, said he and his security detail then rushed to the NY Waterway ferry terminal to pick up his sister.

“When we got to the ferry, my security team and I went to the boat and said, ‘Don’t let the boats move out,’ ” the mayor said.

“Police responded and did a canvass of the area and now they’re going to continue the investigation.”

He’s glad, he added, that his sister called him.

“Nothing would’ve been worse than if someone would’ve gotten on the boat and something would have happened to innocent people,” he said.

Combating gun violence was a centerpiece of the mayor’s campaign.

Thus far, shootings are down 7% this year, with 628 people shot through Sunday compared with 676 victims for the same time frame last year.

Murders are down 9% so far this year, with 178 victims compared with 195 by this point last year.

But the major crime rate, a compilation of seven major felonies including murder, is up 38%.

The rise is fueled by a 40% jump in robberies and a 51% spike in grand larcenies.