Mother of Satan plot: Barcelona terrorists were plotting bigger atrocity at Sagrada Familia using deadly homemade explosive

Raffaello Pantucci, a terrorism expert at the Royal United Services Institute, said: 'The biggest worry now is that when you get an attack, you get a spate of copycat attacks in other cities and countries straight away, like stabbings. We've seen events in Finland and Russia this weekend. So how do you prepare for these kind of attacks?