Aneurin Bevan University Health Board says it will now be taking legal proceedings to take back possession of the car park at Royal Gwent Hospital in Newport.
It says it had asked a group of travellers from France, who have parked caravans in a section of the staff car park, to leave by 4pm today - but they are still on site.
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It is believed weapons, including possibly a small axe, were used in the street fight in the Llanrumney area of Cardiff.
A beautiful day to come with lots more in the way of warm sunshine!
The supermarket was selling hats and flags with the St George's Cross for £1 but was taken down after complaints from shoppers.