An off-duty NYPD officer, Didarul Islam, was among four killed in a mass shooting at a Midtown Manhattan office building. The suspect, Shane Tamura, opened fire in the lobby before moving to another floor and later turned the gun on himself. The incident has sparked calls for action on gun control and mourning from officials. Islam, an immigrant from Bangladesh, was providing security for the building when he was killed. Tamura, a Las Vegas resident with a history of mental health issues, began shooting in the lobby before moving to another floor and later turned the gun on himself. The office building housed both Blackstone, an investment firm, and the NFL headquarters, among other companies. Islam was working security for the building when he was killed. President Donald Trump called the shooting