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

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.

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.