Latest: Police reinforcements sent to Calais after 22 hurt in migrant clashes

Update 12.15pm: Police reinforcements have arrived in the French port city of Calais after clashes among migrants left 22 people injured, with the government warning of more potential violence among those seeking to cross into the UK.
Interior minister Gerard Collomb said five of the victims were injured by gunfire in yesterday's fighting. Speaking in Calais, he blamed migrant traffickers and "totally organised" gangs for the violence.