Environment Agency staff are investigating a severe pollution on the River Morda south of Oswestry today.
A warning has gone out advising people not to allow livestock and pets to go in the river.
The discovery was made overnight.
A large number of fish are believed to have died as a result of the pollution which is understood to have been an acid.
United Utilities said there had been an incident at their water treatment works in Oswestry.
Our team are investigating a severe pollution on the River Morda,below Oswestry. We recommend people,livestock & pets don't go in the River pic.twitter.com/ktfD38zCAt
— Chris Bainger (@ChrisBaingerEA) January 20, 2017
#RiverMorda pollution Weston Pools fishery has not been affected by this pollution We continue to assess the impact to the river pic.twitter.com/ta9tF2cn54
— Chris Bainger (@ChrisBaingerEA) January 20, 2017
LIVE – officers responding to a pollution incident on River Morda #shropshire pic.twitter.com/axwTSacnDt
— Dave Throup (@DaveThroupEA) January 20, 2017
LIVE – River Morda pollution. @EnvAgency officers working to protect local fishery pic.twitter.com/VRxVCEKqwe
— Dave Throup (@DaveThroupEA) January 20, 2017