Vigilance in age of lone wolves

Spain is not alone in grief and mourning. This is yet another vile and abhorrent crime against humanity that contradicts the universal values of peace, tolerance, openness, moderation, diversity, inclusiveness, social justice, solidarity and egalitarianism that we all share.

Spain will remain a model of co-existence reminiscent of the Moorish era when Andalucia personified harmony between the faithful of different confessions.

It is not enough to utter words of renunciation after every terrorist attack. Isil is not in retreat. Its sergeants are swelling, not dwindling. We are failing again and again in addressing this scourge.

As we expect more attacks in Europe, we shall be vigilant and change our approach in the age of lone-wolf terrorism. Dr Munjed Farid Al Qutob London