The boy, a resident of the same area, was found hanging in his house, the police said.
The blockade, at Rashbehari Connector, was lifted around 9.30 pm after the police arrested one person in connection with the boy's death.
The boy's family alleged that he was killed by the accused after being falsely implicated for stealing a pigeon, a Kasba police station officer said.
The police officer also said that prima facie it appears that the boy had committed suicide and investigations were on.