Birds released in Dorset four weeks after oil rescue

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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.

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