'Islamic State fanatics and other terror groups are planning another massive attack on the scale of 9/11, a top US security chief warned today.
Elaine Duke, Donald Trump’s acting Secretary of Homeland Security, said jihadists were using crude knife and van attacks to keep their members engaged and their finances flowing as they plot another ‘big explosion’ similar to the September 2001 atrocities.
Speaking at the US embassy in London, she said intelligence is pointing to extremists plotting to take down planes to inflict mass civilian casualties.
Mrs Duke said ISIS is currently in an ‘interim’ period focusing on a much bigger endgame.
The security chief, who has served three US presidents, said: ‘The terrorist organisations, be it ISIS or others, want to have the big explosion like they did on 9/11. They want to take down aircraft, the intelligence is clear on that.
‘However, in the interim they need to keep their finances flowing and they need to keep their visibility high and they need to keep their members engaged, so they are using small plots and they are happy to have small plots.’'
Read more: ISIS fanatics 'plotting new 9/11': Homeland Security chief says jihadists are working on a 'big explosion' and want to bring down planes to inflict mass civilian casualties