CHARLOTTE, N.C. -- Families in one north Charlotte neighborhood are learning about a series of violent robberies. Several teenagers with guns are targeting neighbors. And they might not even notice anything suspicious about them until it's too late.

A neighbor in the Allen Hills neighborhood was trimming back trees when he was robbed at gunpoint. It's part of a robbery spree in this neighborhood. Police say the crimes are being committed by teenagers. Sylvia Cannon lives in the community.

“I think the parents done a rotten job of raising them,” she said.

Police said the crime spree started two weeks ago. That's when three pizza delivery drivers were robbed at gunpoint. Officers arrested one person in connection with that crime. But they said his accomplices are still on the loose and committing armed robberies in this neighborhood.

“In the last couple days they've actually changed how they do it,” Officer Tom Ferguson said.

He said the robbers held up three people this weekend; the neighbor working at the lake, a construction worker and a man selling produce in the community. Officer said the suspects' descriptions are the same in each case: two black teens ages 13 to 16 on bicycles.

“We're getting the same description of the suspects, the same description of the bikes and the same description of the method they're using,” Ferguson said.

Cannon said it's sad that people so young are committing crime.

“We've got to find a way to make these kids understand that's not the way you make it in this life,” she said.

Cannon just want the teens to stop terrorizing the community. That's why she says neighbors are on alert and ready to call 911 if they see anything suspicious.

DISCUSSION: What Should Be Done To Combat Teenagers’ Involvement In Crime?