In this new wave, terrorist operatives are both capable - witness the suitcase bomb packed with explosives used in Brussels - and very difficult to detect, given our lack of "eyes and ears" on key terrorist arenas such as Syria and Libya.
"When this operation is over, we will want to look at his background and what happened, how he became radicalised and what support he might have been given." Abedi used a suitcase bomb packed with homemade explosives and nails for the attack -- the same method used for Isis bombings at Brussels Airport and Molenbeek metro station last year.
Bomb-making expert Najim Laachraoui was identified by police sources to AFP as the second airport bomber, while police stepped up a huge manhunt for a third airport attacker whose suitcase bomb failed to detonate.
This, a landmark hand-built of rock and one of the aircraft wings, is actually a memorial to the 170 people on UTA Airlines 772 who perished when a terrorist suitcase bomb exploded the aircraft in 1989.
Clegg disclosed that Britain had been using the cutting-edge technology at UK borders since 2001 - the year of the 9/11 terror attacks - while in recent years it had developed specialist teams to respond to the threat of an improvised suitcase bomb. The Technical Response Force teams have the specialist techniques needed to detect, make safe and defuse a terrorist radiological or nuclear device.