Humberside Police are investigating reports of two men being threatened by teenage boys armed with a red painted gun.
The victims were walking away from the five ways roundabout along Park Street in Grimsby at 3.15pm on November 5 when the suspects attempted to rob them.
The men were not harmed and nothing was stolen.
One of the suspects is described as aged between 12 and 13, of slim build, around 5ft 5ins, and wearing a light grey top.
The second suspect was said to be a older, aged around 15 to 16, again of slim build, around 5ft 9ins, and wearing a grey jacket.
Both had light brown short cropped hair.
Anyone with information should call police on 101 quoting reference 16/56615/17.