World Cup winner and former Arsenal star Emmanuel Petit has raised fears of a possible terrorist attack during Euro 2016 and has warned that France’s over-stretched police force will need assistance from other countries to combat any threat.

A French man wanted in connection with deadly terrorist attacks in Paris has been extradited from Bulgaria to France, where he is facing charges of links to terrorism, judicial officials say.

Four men have appeared in a French court, the first to face charges in the Paris terror attacks that left 20 people dead, including three gunmen.

Though we cannot attempt to plan for change, for all the risks that we can and do plan for, it is those for which we cannot prepare that can do the most damage, writes Lucy P Marcus