Toronto police are asking for the public's help with a bank robbery investigation, and have released security camera images of a man believed to be behind a string of heists.

Police say the man entered a bank on The Queensway on Thursday just after 1 p.m., demanding money from a teller. The suspect claimed he was armed with a gun.

Police believe he is the same man responsible for four other robberies.

The suspect is described as between 35 and 45 years of age with a slim build.

Anyone with information on any of the robbery incidents is asked to call Crime Stoppers at 416-222-TIPS.