A Westcliff teenager has been detained for two months for breaching an interim gang injunction.
The 17-year-old member of the Leigh Lot had been seen twice with someone he is not allowed to associate with on May 12 and 15.
He had also been in Leigh Library Gardens and Two Tree Island, which he is banned from entering.
The boy, who cannot be named for legal reasons, appeared at Chelmsford County Court on Tuesday May 18.
He was sentenced to two months in youth detention.
He is among 15 teenagers who were made subject of interim gang injunctions last month.
The five boys from the Leigh Lot and ten boys from O Block must adhere to a list of strict conditions.
This includes not entering parts of Leigh-on-Sea, Southend and Rayleigh.
The court orders aim to reduce their criminal behaviour, protect the community, and steer them away from gangs to make positive changes to their lives.
Chief Inspector Ian Hughes said: “We secured these injunctions to reduce the violence and criminal behaviour associated with these gangs and anyone caught breaching the conditions will be dealt with robustly.
“We are determined to do everything we can to dismantle these groups and work with the individuals concerned to divert them away from this dangerous lifestyle.”