A man stalked through a Manhattan office tower firing a rifle, killing four people, including a New York City police officer, and wounding a fifth before taking his own life, officials said.

The New York police officer killed in a mass shooting in a Manhattan skyscraper on Monday was an immigrant who left behind a pregnant wife, two young sons and distraught parents, while friends and officials in Bangladesh and the United States described him as a hero.

Politicians, relatives and members of the New York City Police Department are gathered at the funeral for the officer who was one of four people killed in the Midtown Manhattan mass shooting. Didarul Islam,