Two young people were surrounded by a large group of teenagers who took their Canada Goose coat and a dark green Prada coat a week ago.
It happened near to the Baytree Centre, on Coptfold Road, last Friday just before 6.30pm.
Another boy was threatened with a knife to hand over his Canada Goose coat and hat in Shenfield Road, Shenfield, on Tuesday.
Passers-by stopped the would-be robbers and recovered the clothes for the victim before they could leave the area.
Officers arrested a 16-year-old from Upminster on suspicion of possessing cannabis.
They also took a 14-year-old from Woodford Green into custody for failing to appear in court.
All six remain in custody.
Tags: Essex, Brentwood, Upminster, woodford green
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