New York City is mourning NYPD Officer Didarul Islam and three other people killed in Monday's shooting inside an office building at 345 Park Ave.

Police Commissioner Jessica Tisch said Officer Islam, who was killed in Monday’s massacre, had been posthumously promoted to detective first grade. Mayor Eric Adams was among the other speakers at a service held at a mosque in the Bronx.

Police Officer Didarul Islam, a father of two with a baby on the way, was one of the four people killed by Shane Tamura inside 345 Park Ave. on Monday.