A “floating megabomb” cargo ship with links to Russia unnecessarily dumped 300 tons of toxic fertiliser into the North Sea in an act of government-sanctioned “environmental terrorism”, an MP has claimed.

Rupert Lowe, a Reform MP, will tell Parliament that “errors” were made after the ship docked at Great Yarmouth with 300 tons of ammonium nitrate potentially contaminated with fuel.

A confidential Department of Transport (DfT) document, seen by The Telegraph, reveals how the authorities considered evacuating the town fearing a “catastrophic” explosion.