"At this moment, our intelligence and counter-terrorism professionals do not have any specific and credible information about an attack on the homeland," he said yesterday after meeting top US security officials at the National Counter-terrorism Center in Virginia.

Obama's comments came in the wake of a deadly shooting incident in California in which a Pakistani-origin couple shot dead 14 people.

Obama said the threat of terrorism has evolved to include smaller groups or individuals, which made it difficult to prevent attacks, but added that they were evolving to face the threat.

The administration will continue to do everything in its power to prevent terrorists from getting into the US, he said, adding they were working on protecting the country on three fronts.

Any refugee coming to the United States, some of them victims of terrorism themselves will continue to get the most intensive scrutiny of any arrival, the US president said, adding that they go through up to two years of vetting, including biometric screening.

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