River Clyde foam investigated by environment agency Published duration 4 April 2014

media caption Sepa is investigating what caused the foam to form on the river

Experts are trying to establish why a large expanse of foam has appeared on the River Clyde in Glasgow.

The Scottish Environment Protection Agency (Sepa) said it had received a number of calls.

It is believed that the foam is coming from an overflow pipe located near the Tradeston Bridge, known locally as the Squiggly Bridge.

The foam stretches from the Broomielaw in the city centre to the Clyde Arc, known locally as the Squinty Bridge.

A statement from Sepa said: "Sepa currently has a number of officers committed to investigating the pollution incident in the River Clyde and samples will be taken for testing to determine any potential impact of the substance on the local environment.

"Efforts are also ongoing to determine the source of the pollution."

image caption The foam stretches from the Broomielaw to the Clyde Arc bridge

image caption The foam is believed to be coming from an overflow pipe near the Tradeston Bridge

image caption A mound of foam has appeared on river bank shrubbery on the south bank of the river

image caption The foam is across from the Squiggly Bridge on the south bank

image caption The foam has broken up in patches on the river

image copyright Christina Thomson image caption Elevated views show the length of the foam spread on the river