Around 800 jihadists have returned to Europe to launch attacks after being trained by extremists in Iraq and Syria, intelligence services have warned.
Counter-terrorism officers said the fanatics had been recruited by the Islamic State or Al Qaeda-linked groups and were waiting for the order to strike on the Continent.
Around half of the 700 Britons who have travelled to fight in the Middle East have also returned, with some believed to be planning attacks in the UK. …
Counter-terrorism sources in Spain said 800 Islamist extremists had returned to Europe to carry out similar strikes, it was reported by Spanish radio station Cadena Ser, according to The Times.
Some were being tracked, but others had dropped off the radar.
The source said: ‘These people are not well trained, but they are poised and prepared to do anything. Once they have been indoctrinated, they receive the minimum training.’
A Spanish counter-terrorism source said [Moroccan train attacker Ayoub El] Khazzani had lived in Spain for seven years until 2014.