Four people were killed and a fifth was injured in a mass shooting at a Midtown Manhattan office building on Monday.

Officials said the gunman fatally shot himself after his attack, which set off a chaotic scene that rippled out into the heart of Manhattan during rush hour.

Familly, friends and colleagues are preparing to mourn the NYPD officer killed in this week’s Manhattan office attack at a funeral Thursday, less than two days after hundreds stood in salute as his casket received a dignified transfer to the mosque where he’ll be remembered.