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The US has opened a three-day summit on countering violent extremism, the BBC reported.

Representatives from around the world are attending the gathering, which follows shooting incidents in Denmark, France and Australia.

Vice President Joe Biden said it was imperative to engage with immigrants who may be radicalised because of marginalisation.

"Societies have to provide an affirmative alternative for immigrant communities," he said.

The vice president said that countries needed to provide "a sense of belonging that discredits the terrorist's appeal to fear, isolation, hatred and resentment."

The White House believes Europe is especially susceptible to terror attacks because immigrants there are often less well integrated into society.

However correspondents say the White House also wants to instil a sense of urgency to counter the threat posed by home-grown terrorism and the radicalisation and recruitment of Americans, especially disaffected young people.

On Wednesday, President Barack Obama will address the White House conference before speaking at the state department on Thursday at a gathering which will be attended by representatives from roughly 60 countries, including Jordan, Egypt, the United Arab Emirates, Kuwait and France.