JACKSONVILLE BEACH, Fla. -- The Nassau County Sheriff's Office is investigating a robbery at the Kangaroo Express in Callahan on Monday, deputies said.

Undersheriff George Lueders said an employee arrived at the store, located on US 1 and Ratliff Road, about 4:50 a.m. and saw a stool flipped over inside the store.

That tipped the employee off to a possible break-in.The employee also noticed that someone had taken money from the ATM and the surveillance VCR was missing.

Investigators are calling the robbery suspicious because there were no signs of forced entry.

Police have not named any suspects in this case but are pursuing multiple leads.