NEW YORK - As the NYPD continues piecing together the motive behind a deadly Manhattan shooting rampage, officials now say the gunman bought the AR-15-style rifle and car used in the attack from his supervisor at a Las Vegas casino.

Shane Tamura, 27, fatally shot four people Monday at a midtown office building that houses the National Football League’s headquarters before killing himself. Police said Wednesday the weapon and vehicle came from Tamura’s former boss at the Horseshoe Las Vegas, where he worked in the surveillance department.

Detectives also uncovered prescription medications and disturbing handwritten notes in Tamura’s Las Vegas apartment, including one where he claimed to suffer from a brain disease linked to contact sports and accused the NFL of covering up its dangers.

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