The alleged gunman at a shooting rampage in a midtown Manhattan office building was identified as 27-year-old Shane Tamura, of Nevada.

Didarul Islam, 36, was the father of two, with a third on the way, and was working a second job as a security guard at the building where shots rang out.

Four people were killed, including an off-duty New York City police officer, when a gunman opened fire in an office tower ...