A teenage girl suffered burns after a firework was thrown at her in Palmers Green on Halloween night.
The youngster's clothes were also burnt in the attack in Ecclesbourne Gardens.
Along with two friends she was playing trick or treat and calling at houses in the area.
Three young men wearing Halloween masks came up to them and threw a lit firework at the girl.
She needed hospital treatment for minor burns to her legs and lower back and also suffered from shock.
Her condition is not believed to be serious.
The incident took place on Staurday at 6pm. The attackers are all aged around 14.
Call the crime desk at Edmonton police station on 0181 345 4441 if you have any information.
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