Voters in Switzerland have backed a tightening of gun laws to conform with European Union regulations.

Almost 64% of voters in Sunday’s referendum supported tougher restrictions on semi-automatic and automatic weapons, final results show.

Switzerland is not an EU member, but risked removal from the open-border Schengen Area if it had voted “no”.

Nearly 48% of Swiss households own a gun – among the highest rates of private ownership in Europe.