Police are searching for three people who walked into Lankenau Medical Center in Wynnewood over the weekend and stole 18 colonoscopy devices worth a combined $450,000.

“What we’re finding out is that there’s a black market available for them," Lower Merion Police Superintendent Michael J. McGrath said Thursday.

The theft happened between 3 and 5 p.m. Saturday, police said, after a newer-model Jeep Wrangler dropped off two of the three suspects at the front of the Lancaster Avenue hospital. They made their way to a “secured area," police said.

“They appeared to know precisely where to go, and they pried the door open,” McGrath said.

Surveillance video shows the suspects walking out of the hospital carrying three bulging backpacks. The theft was reported to police two days later, about 7:20 a.m.

The suspects are a white man in his early 20s who wore glasses, what could be a dark, curly wig, a dark sweatshirt, blue jeans, and black sneakers with white soles. He was with a white woman in her late 20s who wore a pink beanie, blue jeans, black jacket, white shirt, and black sneakers, and a white man in his late 40s who wore a gray fedora, dark coat, scarf, blue jeans, and black boots.

Anyone with information about the theft is asked to contact Lower Merion Detective John Mick at 610-645-6229 or jmick@lowermerion.org.