The Environment Agency is already investigating how water from the river Clwyd breached flood defences built on the Glasdir site.

BBC: North East Wales

The Environment Agency has been clearing "pinch points" along the River Thames to ensure water continues flowing further downstream.

BBC: Thames Water says drainage system 'overwhelmed'

Water levels along the River Thames have "levelled off" but still remain very high, the Environment Agency (EA) has said.

BBC: River Thames flood water levels 'stabilise'

With 148 countries sharing at least one transboundary river basin and two thirds of the world's 276 river basins being shared by two countries, cooperation is the key to preserving water resources and protecting the environment, but also to fostering and maintaining peaceful relations within and among communities.

UNESCO: Water cooperation: more urgent than ever

Water levels were predicted to peak in the River Thames over the weekend, but on Saturday morning an Environment Agency spokesman told the BBC levels in the river were "starting to level off".

BBC: Flood warnings remain in many areas

The Environment Agency said no signs of contaminated water from the fire had been found in the nearby River Wye.

BBC: Fire on Rotherwas Industrial Estate

The Environment Agency warned on Sunday the site could become flooded due to rising water levels on the River Thames between Newbridge and Kings Lock.

BBC: Oxfordshire homes flooded due to heavy rain