Calgary police were called to the Alberta Children’s Hospital for reports of an incident involving a firearm at around 8:15 p.m. on Sunday.
Families of patients inside the hospital confirmed to Global News that several units were put on lockdown but they were not given further details.
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Jay Bruzell was at the hospital where his 16-year-old son was getting X-rays and confirmed that his unit was put on lockdown.
Police said officers and hospital security staff conducted a sweep of the building and found nothing.
The lockdown was lifted by 9:40 p.m.
Witnesses said dozens of police vehicles surrounded the hospital and closed nearby roads.
Police continue to investigate.