NEW YORK (CBSNewYork) — The NYPD found no criminality after officers became sick at a Shake Shack in downtown Manhattan, Chief of Detectives Rodney Harrison tweeted early Tuesday.

Sources told CBS2 it appears the incident was accidental, possibly the result of cleaning solution that wasn’t properly removed from the shake machine.

READ MORE: NYC To Require Proof Of Vaccination For Indoor Dining, Fitness And Entertainment

Three officers became sick Monday after drinking shakes from the restaurant located at Broadway and Fulton Street.

Police initially suspected an employee may have contaminated the shakes with bleach.

READ MORE: Gov. Cuomo Sexually Harassed Multiple Women In Violation Of State And Federal Law, AG Investigation Finds

Employees were questioned, and a shake sample was taken to a lab for testing.

The officers were hospitalized, but have since been released.

MORE NEWS: Cuomo Not Stepping Down After Investigation Finds He Sexually Harassed Multiple Women

Note: This post was updated at 4:30 a.m. on June 16, 2020.