The incident took place at P.S. 15 Patrick F. Daly School on Dec. 5, police said.
The robber then stuck his hands in the victims pocket and demanded money, police said.
Omar Gray, 37, was arrested for the murder of Howard Sterling, who was shot in Red Hook last month.
Eight men and one woman stuffed the clothes into their knapsacks before fleeing, police said.
The Swedish chain saw a dozen major crimes between January and September this year, records show.
The hinges to the door, which connects to an alleyway, had been unscrewed, according to police.
The victim stated that the cash went missing from his wallet between Sept. 28 and Oct. 12, police said.
Richard Mercado, 26, was arrested for injuring six men with a stolen barstool last week, police said.
Police are offering a $2,000 reward for information about a suspect in a robbery and assault on Aug. 8.
A Louis Vuitton bag worth $1,975 and $200 in cash were stolen from the bar on Aug. 2, police said.
Ronald Maxwell, 20, was arrested for stealing almost $50 worth of snacks on July 19.
A 30-year-old woman was arrested after crushing a Volkswagen Beetle's hood in Carroll Gardens.
A man wielding a laser pointer made off with an iPhone, $110 cash and more, police said.
A 45-year-old man was punched in the face and nose when he resisted the muggers Monday morning.
An 18-year-old woman was punched and robbed of her cellphone by a group of men on Saturday, police say.
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