Victims of a suspected acid attack on a busy city centre street tried to sooth their skin with milk, reports say.
Five people were treated for minor injuries after emergency services raced to City Road in Cardiff on Sunday.
Empty water bottles and milk cartons could be seen strewn across the road in the aftermath.
Police have not confirmed the nature of the incident but said officers were called to the scene following a reported assault.
A statement added that five people were left with "superficial injuries".
A cordon was put in place outside a row of businesses including Afro Barber Shop and Ponnuswamy Restaurant.
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One witness told MailOnline he saw a man covered in milk trying to "neutralise the acid" on his skin.
He said: "When I went into Tesco a bloke came storming towards me topless covered in milk, saying he'd had acid thrown on him, using the milk to neutralise the acid.
"All the staff in Tesco were clearing up the milk. It was bonkers."
South Wales Police said: "At around 2.44pm today emergency services attended an address on City Road, Cardiff, after reports of an assault.
"Five people attended hospital with superficial injuries. Officers are appealing for anyone with mobile phone or dash-cam footage of the incident or the aftermath to please contact us quoting ref 2100312749."
South Wales Fire and Rescue Service confirmed that firefighters were "assisting" but said it was a "police matter".
A Welsh Ambulance Service spokeswoman said paramedics were called shortly before 3pm.
A number of ambulance crews, including the Hazardous Area Response Team, attended.
The spokeswoman added that their crews took two people to the University of Wales Hospital in Cardiff.
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