"The investigation is focused on whether one or more donations – including of services – accepted by Leave.EU was impermissible; and whether Leave.EU’s spending return was complete," the electoral watchdog said in a statement.
Leave.EU did not lead the official campaign for Britain to quit the EU, but the group was credited with mobilising people who do not typically vote and helping influence regular voters. Britain vote 52 to 48 percent in favour of 'leave'.
The Commission has the power to impose fines and other sanctions if it find rules were broken, and in some cases can refer matters to the police for criminal investigation.
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