Story highlights UK's top counterterror officer says ISIS is focused on spectacular attacks against Western way of life

He says his comments do not refer to a specific known plot, but a general threat profile

London (CNN) British police are preparing for "enormous and spectacular" potential attacks on the UK as ISIS moves into its "next natural phase," Britain's senior counterterrorism officer said Monday.

Mark Rowley, assistant commissioner of London's Metropolitan Police, said that in the wake of the Paris terror attacks, ISIS had moved on from a "narrow focus on police and military as symbols of the state, to something much broader."

"You see a terrorist group that has big ambitions for enormous and spectacular attacks, not just the types that we've seen foiled to date," he said, citing as another example the downing of Metrojet Flight 9268.

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Rowley also mentioned the need for investigators to guard against terrorist attacks like the recent explosion aboard a Somali passenger plane flying above East Africa. The suspected bomber was blown out of the plane and died and two others were injured in that attack, for which the jihadist group Al-Shabaab took responsibility.