British police investigate controversial Brexit campaign ad

Campaigning has resumed ahead of Britain's European Union referendum, with police investigating a controversial campaign billboard. Image: Flags at a remain in, pro-EU Referendum event in Parliament Square, Central London (AAP)

The poster, circulated by the pro-Brexit, anti-immigration UKIP party, shows a huge line of migrants snaking into the distance, with the words "Breaking Point" written over them.

 

The unveiling of the poster comes as Europeans living and working in the United Kingdom ponder what an exit might mean for their freedom of movement across the EU.