The St. Catharines Hospital was put under a 'Code Silver' lockdown earlier today after concerns that there was a person with a weapon.
Niagara Regional Police were called to the hospital after reports of an armed person in the emergency department.
Officers cleared the code a short time ago.
Meantime, Niagara Health says as a result of today’s incident, they will be postponing the Niagara-on-the-Lake engagement meeting.
"We have made this difficult decision out of an abundance of caution and based on feedback from staff."