LOWER MANHATTAN (WABC) -- Police say there was no criminality involved in an incident involving three NYPD officers who fell ill Monday evening after drinking milkshakes, despite earlier allegations by police unions that the officers had been poisoned.
The incident was reported at a Shake Shack restaurant inside the Fulton Street subway station in Lower Manhattan.
Three police officers on protest patrol said they felt sick after taking a drink from the shake. One reported the shake had a bleach smell.
They were taken the hospital, treated and released.
Early Tuesday morning, NYPD Chief of Detectives Rodney Harrison said an investigation found no criminality:
"After a thorough investigation by the NYPD's Manhattan South investigators, it has been determined that there was no criminality by Shake Shack's employees."
Officers could be seen collecting evidence, including bags of food and milkshakes, and workers were questioned.
No one was ever arrested or charged.
Detectives are looking into whether the shake machine with improperly cleaned, with cleaning fluid remnants remaining inside at the time the officers' shakes were prepared.
But before the investigation was completed, multiple police unions put out statements, including one from the Detectives Endowment Association saying their officers were intentionally poisoned.
That tweet was shared about 11,000 times.
And the PBA warned all of its members to carefully inspect any prepared food items they purchase while on duty.
Shake Shack issued a statement saying the company was horrified by the reports.
The company also said it is "working hard to get the full picture. In the meantime, we're relieved to hear the officers are all okay."
Shake Shack said they continue to cooperate with police in the investigation.