Two teenagers walking through suburban Onekawa in Napier on Saturday afternoon were told they would be shot if they did not hand over their cellphones.
The pair, a 16-year-old and a 17-year-old were confronted by a man about 5.30pm.
He kept one hand in his pocket, as if holding something, and told the boys he had a gun.
He threatened he would use it if they did not hand over their cellphones.
"Being confronted with threats like that left these boys pretty shaken," Detective Sergeant Emmet Lynch said.