Police have arrested seven people, including two 15-year-olds, believed responsible for a string of at least 20 armed robberies and carjackings on Detroit's east side.

Police Chief Warren Evans tells reporters Tuesday that the crime spree likely started in late September.

He says the suspects were arrested over the past two weeks. The five adults range in age from 17 to 20.

Carjacked minivans were used in some of the holdups. The suspects would jump from the sliding doors and rob pedestrians.

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On Oct. 19, police chased a stolen minivan matching the description of one used in an earlier robbery of two women. The van crashed and rolled over. Two of three people inside were arrested.

Others in the team later were picked up by police.