Counter-terrorism police have urged Premier League clubs to enhance safety protocols due to an ISIS terror threat targeting Champions League quarter-final matches.

Madrid, London, and Paris are increasing stadium security measures, with Madrid deploying over 2,000 police officers for the upcoming games.

UEFA insists the matches will continue as planned, with robust security measures tailored to counter the identified threats.

The ISIS threat was publicized through a pro-IS channel, showing images of the specific stadiums under threat.

European countries are on high alert, particularly after a recent terrorist attack in Moscow, with the UK's terror threat level at 'substantial'.

The National Counter Terrorism Security Office has advised clubs to have contingency plans ready for potential terror incidents.