MILWAUKIE, Ore.—The Clackamas County Sheriff’s Office is seeking tips in a string of robberies and assaults at a single Milwaukie convenience store.

All three incidents happened within an eight-week period at the Vista Market (14666 SE River Rd., Milwaukie).

The first incident involved shoplifting, with the suspect working with an apparent accomplice — but the next two incidents included violent assaults of store personnel.

Authorities believe the same suspect may be involved in all three incidents.