On Wednesday evening, a man threw a fragmentation grenade into a café in Grenoble, leaving 15 people injured.

The following day, an Afghan shouting ‘Allahu Akbar’ drove his car into a crowd in Munich and injured more than two dozen.

The previous week in Brussels, two men strolled through a metro station firing bursts from Kalashnikovs – one of several shootings that day in the Belgian capital, which wounded three people.