Metro

Gunman prepped for massacre while mom was on vacation in New Hampshire

Adam Lanza spent two days home alone preparing for his Connecticut schoolhouse massacre after his mother went away on a mini-vacation, it emerged yesterday.

Nancy Lanza checked into the Omni Mount Washington Resort in Bretton Woods, NH, at 12:10 p.m. Tuesday, and left around the same time Thursday.

The drive is about 4 1/2 hours, so she would have arrived back home in Newtown late in the afternoon or early evening, according to Headline News — just hours before Adam shot her dead in her bed before the Friday morning rampage that killed 20 first-graders and six educators.

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He was armed with a Bushmaster .223-caliber assault rifle and two handguns, a Sig Sauer 9mm and a Glock 10mm, all belonging to his mom.

News of Nancy Lanza’s getaway came as a funeral home in her New Hampshire hometown called to “discreetly” claim her body, the medical examiner said.

Meanwhile, investigators said they have been able to pull salvageable information from computers at the gunman’s home.

“Every day we learn a little bit more, both from the computer and from talking to people,” said a law enforcement official.

Police also said yesterday that the second surviving shooting victim is an adult.