City police are investigating two armed bank robberies within an hour on Thursday morning.

Ottawa cops say they are not yet sure if the two robberies are connected, but in both cases an armed assailant was involved.

The first happened just before 11 a.m. when police responded to the TD Canada Trust along Strandherd Dr. in Barrhaven.

At about noon, police said a RBC branch at 475 Bank St. was hit. In this robbery, a lone suspect with a gun was involved.

Police did briefly detain a person at the scene of the Bank St. incident, but quickly released the person when they determined they were not involved.

The police robbery unit is investigating both incidents.

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