Three Hamilton schools were locked down Tuesday morning while police searched for a suspect from an early morning armed robbery that happened in Waterloo today.

The Hamilton-Wentworth District School Board said that Greensville, Millgrove and Spencer Valley schools were all placed in a "hold and secure" because of an ongoing police investigation. Police tweeted just after 11:30 a.m. that the hold and secure alert had since been lifted.

Waterloo police spokesperson Alana Russell told CBC News that the investigation stems from an armed break and enter that happened in Kitchener early Tuesday morning.

Russell said that police were called to a home in Kitchener, where three men with guns forced their way into a home and stole electronic devices.

Police pursued the suspects in a car, and OPP officers stopped their vehicle with spike strips, Russell said.

Two of the three men were arrested, she said, but one is still at large, and now police are searching for him in Hamilton.

Russell said it is unclear if the man is still armed.

Hamilton police Const. Steve Welton said that parents can be assured there are no dangers at any of the schools that were identified, "but police want to be diligent and safe while searching the area as part of the ongoing investigation after the robbery and arrests."