Police are continuing to investigate an assault on City Road, Cardiff, at around 2.45pm yesterday (Sunday, September 5).
Four teenage boys and a 20-year-old man were taken to hospital with minor injuries and discharged later the same day.
It is understood that those involved are known to each other and arrest enquiries are on-going.
Despite initial reports from the scene, it has been confirmed that the clear liquid sprayed during the assault was not acid and is now believed to be ammonia.
Ammonia is commonly used in dyes and cleaning products.
Anyone with mobile phone or dash-cam footage of the incident or the aftermath, is asked to please contact South Wales Police quoting ref *312749.
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Via email: SWP101@south-wales.police.uk