Two teenagers who were arrested on suspicion of causing grievous bodily harm have been bailed by police.
Officers were alerted to an alleged attack on Dalton Avenue in Carlisle, near to the junction with Balfour Road.
The alleged attack is said to have taken place just before 7pm on July 12.
A 17-year-old was rushed to hospital with head injuries.
Following the allegation of an attack, officers arrested a 14-year-old boy and a 16-year-old boy.
They have since been bailed.
Police are appealing for anyone who may have seen the assault or know anything about it to call 101.
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