An 18-year-old girl suffered serious injuries to her face and another teenager was also hurt during a possible stabbing.
Police today confirmed they were investigating after the sickening scenes on Monday.
The violence erupted during what police termed a "disturbance".
The attack left two teenagers needed hospital treatment, police confirmed.
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The victims were injured after the attack in Portland Road, Warrington.
Police say at this stage it is not known what caused the injuries amid unconfirmed reports scissors were used.
A 19-year-old man sustained what officers described as "a minor puncture wound to his hand".
But an 18-year-old woman suffered "serious injuries to her face" - Cheshire Police said today.
Both teenagers turned up at hospital for treatment.
Police have made two arrests as part of the probe.
A Cheshire Police spokesman said: "At 6.20pm on Monday 8 February police were made aware of two people self-presenting at hospital following a disturbance.
" A 19-year-old man sustained a minor puncture wound to his hand. An 18-year-old woman sustained serious injuries to her face."
A 25-year-old man from Urmston has been arrested on suspicion of assault.
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He remains in custody assisting police with enquiries.
A 19-year-old man from Runcorn who was arrested on suspicion of assault has since been released on conditional bail.
Anyone with information is asked to contact Cheshire Police on 101 quoting IML 913493 or report it via https://www.cheshire.police.uk/ro/report/
Alternatively information can be passed on to Crimestoppers anonymously on 0800 555 111.
