The alert comes amd heightened fears across Europe of a Paris or Brussels-style terror attack

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The alert comes amid heightened fears across Europe of a Paris or Brussels-style terror attack involving Islamic State jihadis who have returned home after training in Iraq and Syria.

Swedish police are investigating a potential terror threat planned in the capital Stockholm, the US embassy said.

Officials warn "terrorist groups continue to plan near-term attacks throughout Europe, targeting sporting events, tourist sites, restaurants, and transportation".