In an interview with British newspaper The Sunday Times, Wallace al-Qaeda – the group behind the notorious World Trade Center attacks that killed nearly 3,000 people in the US on September 11, 2001 – still strives Air strikes on "and develops technologies to knock down aircraft.
"The aviation threat is real," Wallace said in an interview on Saturday night. "(Al Qaeda) have reorganized, pushing more and more plots towards Europe and are familiar with the new methods."
The rise of ISIS has overshadowed the al-Qaeda threat in recent years – especially after the most prominent leader Osama Bin Laden was killed in Pakistan 2011 by US forces.
But Wallace said the danger had never really been reduced.
"Al Qaeda sat quietly in the corner, trying to figure out what the 21st century looked like when ISIS became the latest terrorist boyband," he said. "But they did not go away."
British intelligence chiefs are also concerned about US President Donald Trump's decision to withdraw US troops from Syria. Wallace said he will create a "new safe haven for Islamists to launch attacks on the West." "
Wallace's statements Over the weekend, in widespread chaos at Gatwick Airport in the UK, drones flying overhead have had to cancel dozens of flights.
There is no indication that the incident occurred at the airport Gatwick is linked to terror, Sussex police said earlier this week.