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A Member of the European Parliament for South West England and Gibraltar has been arrested after breaking into a Belgian military airbase.
Molly Scott Cato and fellow Green Party MEPs Michèle Rivasi, of France, and Tilly Metz, from Luxembourg, said they were protesting against its stockpiling of American nuclear bombs.
The trio scaled the perimeter fence and unfurled a banner reading "Europe free of nuclear weapons".
The protest came after US President Donald Trump's announcement that he was withdrawing from the intermediate-range nuclear forces (INF) treaty earlier this month.
The MEPs were held in a local police station and questioned.
Ms Scott Cato tweeted that they were released.
Ms Cato's constituency covers Bristol, Cornwall, Devon, Dorset, Gloucestershire, Somerset, Wiltshire and Gibraltar.
Updating MPs on the weekend summit with European leaders about a Brexit deal, Theresa May says: "This is the right deal for Britain."