Birds released in Dorset four weeks after oil rescue
Some of the seabirds caught up in a mass pollution incident off the south coast have been released into the wild after being treated by the RSPCA.
About 30 birds were given their freedom from a cliff top in Portland in Dorset.
More than 300 birds, mainly guillemots, were treated after being caught up in the spill of a chemical used as an oil additive by ships.
The source of the pollution was never found.