Pictured: Police officers with metal detectors serch the green at the Strand in Swansea, south Wales. Sunday 12 March 2017
Re: Police are investigating a "serious assault" in Swansea city centre, Wales, UK.
Several roads were closed for a time on Sunday morning for crime scenes officers to investigate.
The Strand remains closed, said a spokesman for South Wales Police.
Police were alerted after 3am on Sunday.