MYSTERY still surrounds the sudden appearance of foam in Milnsbridge.
Residents were shocked when they awoke to find thick white foam smothering the River Colne yesterday morning.
The substance was also seen bubbling up through the drains on Morley Lane and spilling into the streets.
It was 1ft-deep in places, according to eye-witness reports.
Today, the Environment Agency said it was still trying to track down the source of the foam.
But it confirmed local fish and wildlife seemed to have been unharmed by the pollution.
Rob Walsh, of the agency, said: “We are still investigating and are trying to find the cause of the incident.
“We would be grateful if any members of the public know anything, if they could let us know.
“As far as we are aware, there have been no dead fish or damage to wildlife.
“The river is running quite high at the moment, which is good because it means it is flushing it through the system rapidly.
“But this makes it more difficult for us to trace the source.”
Joy Black, 31, first spotted the foam in the river at 8.25am on yesterday.
The mum-of-one, who lives on George Street, said: “Our house backs onto the river. We were just getting ready for school when my husband said ‘Look, the river is full of foam’. We thought it seemed very odd.
“As I walked my son to school, it was spurting out of the drains on Morley Lane too.
“I don’t know what it is or where it is coming from, but it seems really strange.”
Anyone with any information about the foam is asked to call the Environment Agency incident line on 0800 807060.