“The terrorist organizations, be it ISIS or Al-Qaeda 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,” the acting US secretary of homeland security said during a visit to the UK, as cited by British media.

On September 11, 2001, (aka 9/11) terrorists hijacked aircraft and carried out the deadliest attack in history, killing almost 3,000 people.

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“The threat is still severe,” she stated on Wednesday in London following her meeting with Home Secretary Amber Rudd, where the officials discussed terrorist content online. 

The terrorist groups are using smaller attacks to keep their members “engaged,” remain visible and provide the flow of finances, according to Duke.

At the same time smaller plots can be followed with major ones, she warned.

“Creating terror is their goal. A bladed weapon attack causes terror and continues to disrupt the world, but that does not mean they have given up on a major aviation plot,” she said.

Tough internet control is necessary to prevent terrorists’ propaganda from spreading online, Duke said. She added that while tech firms are already cooperating on these issues with the authorities, there is still much to be done.

“We will continue to push as far as we can go. I think that we have the cooperation of those companies and we just need to work on that,” she said. Social media firms joining a meeting of G7 interior ministers to discuss the issue this week “is a positive sign,” she said.

“There has been a shift and for us somewhat with the Charlottesville incident,” said Duke, adding that tech companies are under “social pressures” and have “to balance between keeping their user agreements and giving law enforcement what they need.”