Four people were killed and 10 others seriously injured when a driver plowed into a Long Island nail salon Friday, police and law enforcement sources said.

The minivan smashed through the Hawaii Nail & Spa storefront at 794 Grand Boulevard in Deer Park just after 4:30 p.m. — trapping customers and employees inside, according to cops and a report.

The vehicle came to rest towards the back of the salon, leaving a trail of destruction in its wake, photos show.

The entire glass storefront had been shattered and the ceiling was ripped down in the crash.

“There were people trapped and we extricated them and transported everyone to area hospitals,” Deer Park Third Assistant Chief Dominic Albanese told Newsday. “They were trapped inside. Everybody was inside the salon.”

“It’s horrible. It’s horrible. It can be tough for the community and tougher for the volunteer fire department, but you know we’re going to get through it,” Albanese added.

The nail salon is located in a strip mall on Grand Boulevard near Commack Road that includes a liquor store and a tattoo parlor.