A ship has dumped about 300 tonnes of potentially explosive cargo into the North Sea, the BBC has learned.
The MV Ruby carried out the operation off the coast of Great Yarmouth in Norfolk, over fears the ammonium nitrate fertiliser had been contaminated with fuel oil.
The dumping has prompted an outcry from environmentalists and local businesses.
The Maritime and Coastguard Agency (MCA) said "hydrocarbons and seawater" had been found on bags holding the material.
The agency said the bags were likely to have been affected when the ship ran aground and its hull damaged several weeks ago.
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