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

The four victims who were shot and killed by a gunman inside a Midtown Manhattan office building on Monday night have been identified.They include two women — a Blackstone executive and a Cornell graduate — and two security guards,

An NYPD officer, a Blackstone executive, a Rudin Management associate and a security guard were killed in the shooting at Manhattan's 345 Park Avenue.