Authorities have completed an intense 12-day search for evidence at the Long Island house of the man accused of three Gilgo Beach cold case murders and turned up a cache of weapons but said it would take time to sort through “massive” amounts of material they found.

Suffolk County District Attorney Ray Tierney said the search of the house and yard was finished Tuesday, but he didn’t describe most of what was found at Rex Heuermann’s home. Authorities were looking for “trace” materials, such as hair fibers, DNA and blood, and any “tangible” evidence. Tierney said there wasn’t a “singular” piece of evidence that stood out.

The search included tearing up the back yard. Associated Press drone footage over the weekend showed a yellow excavator digging into dirt and authorities in hazmat suits with shovels.

“We have obtained a massive amount of material,” Tierney said at a news conference Tuesday outside the Massapequa Park house where Heuermann lived with his wife and two kids. “It’s going to take quite some time.”

Heuermann was arrested July 14 and charged in the deaths of Melissa Barthelemy, 24, Megan Waterman, 22, and Amber Costello, 27, who were sex workers before they were killed. They were found wrapped in burlap on Ocean Parkway in Gilgo Beach on Long Island in 2010. He’s also a prime suspect in the death of a fourth woman, Maureen Brainard-Barnes, 25, but he has not been charged in that case. The women are commonly referred to as the “Gilgo four.”

What weapons were found at the house?

Investigators found dozens of weapons in a “vault” in the basement of the house that was a large enough area for a person to enter, Tierney said.

There were a total of 279 weapons found. Tierney said they were all “what would commonly be referred to as a firearm” but some might not meet state or federal classifications to be considered a firearm.

Heuermann had 92 handgun permits, and there were “quite a few long guns as well,” Tierney said.

What were investigators looking for?

Tierney said crews pored over a huge amount of items in a house that “could be categorized as cluttered.” He said there were a lot of boxes and other things cluttering the house and the basement.