The PM ordered British warplanes to join US airstrikes on war-ravaged Yemen on Thursday night in response to rebel attacks on western commercial shipping.
Mr Sunak insisted the mission was "necessary, proportionate" action against military targets to "disrupt Houthi capability".
But the Iran-backed militants yesterday warned they would avenge the airstrikes, which they claim killed at least five people, in the region. And there are fears British extremists could also launch lone-wolf attacks here.
VIGILANT
A security insider said: "I expect the threat level of terrorism in the to increase.
"This will have been something taken into consideration." A western intelligence expert added: "I believe the terror threat will increase because of the twisted anti-western narrative.
"Britain as a kind of deputy to America is high in the sights of jihadists and the expanding Middle East conflict is making us a greater target, even though our actions were justified.
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