Foreign governments such as Russia and China have probably caused the collapse of a voter registration website in the run-up to the EU referendum, a committee of British MPs claims.

More than a million potential voters applied to register online in the run up to the deadline two weeks before last June's vote and the government extended the cut-off point after the website crashed, blaming it on a late rush by mainly young citizens.

In a report, parliament's Public Administration and Constit...