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Security staff at Wales' biggest hospital are now wearing CCTV cameras to try to cut down on violence against staff and patients.
Cardiff and Vale University Health board says there are between 2,500 and 3,000 assaults on its staff each year.
Between April and December last year there were 543 recorded incidents of verbal or physical abuse in the Hywel Dda Health Board.
In the Cwm Taf University Health Board there were 282 incidents.
Security staff at Wales's biggest hospital are trialing the use of body-worn CCTV cameras.
Cardiff and Vale University Health Board reports between 2,500 to 3,000 assaults on its staff each year, with nearly half considered intentional.
25% of incidents against NHS staff across Wales happen at Cardiff and Vale UHB.
The cameras have been commissioned to reduce the likelihood of violent assaults against staff.
Five devices are being used at the University Hospital of Wales with six more currently on order for use across other health board site.