Updated

One of two wanted suspects in the gruesome murders of a couple in Massachusetts was under arrest Monday afternoon, police said, adding that a second suspect was still on the loose.

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Police called the murder scene at a home in Peabody "messy and cluttered," and had to use a special X-ray machine to figure out how many victims there were, Fox 25 reported. The bodies reportedly turned up in the basement, wrapped in rugs and plastic.

The man and woman killed were dating and lived together in the house, according to the news station. They were identified as 37-year-old Mark Greenlaw and 39-year-old Jennifer O'Connor.

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Cops arrested 45-year-old Michael Hebb shortly after noon, according to the news station. Police did not disclose how he may have known the couple.

Earlier, police said the suspects apparently were driving a 1992 Acura and could be armed, WBZ added.

The murders weren’t a random act -- and officers had been to the home "for all kinds of incidents," Police Chief Thomas Griffin said. Neighbors told Fox 25 the home was rented out by a 67-year-old permanently disabled man named David Moise.

The bodies turned up Sunday -- hours after a woman ran out of the home and flagged down a car that brought her to the state police barracks in Danvers late Saturday, according to a spokeswoman for the Essex District Attorney's Office.

“The crime scene is very difficult right now, it’s quite messy,” Essex District Attorney Jon Blodgett added. “We’re doing our best to sift through this. It takes time. The medical examiner’s office is on the way, and we’re using all those resources to ascertain exactly what happened at this property.”

Rachel Hrubes, a neighbor, told the station she wasn’t surprised something gruesome occurred.

"I'm not in shock definitely not. I'm very sad but not in shock," she said.

State police, Peabody police and the district attorney's office are investigating. Peabody is about 20 miles northeast of Boston.

Click for more from Fox 25.

The Associated Press contributed to this report.