Sweden’s Prime minister Stefan Lofven signs a condolences book for the victims of the Paris attacks at the France embassy in Stockholm, Sweden.

Swedish police were hunting Wednesday for a man wanted for “planning a terrorist act,” security services said, with the country on high alert following the deadly terror assault in Paris last week.

An arrest warrant has been issued for the suspect, whose identity has not been revealed, the head of domestic intelligence and counter-terrorism Anders Thornberg told a press conference, saying no link had yet been proven with the Paris attacks.

On Wednesday, Sweden’s security police (SAPO) raised their terrorist threat assessment by one step, to four on a scale of five, following the attacks in France.

“One of the reasons for the increase is that the Security Police have received concrete information and made a judgement that we need to act within the framework of our counter-terrorism operations,” SAPO said in a statement.

Level four means that there is a high probability that “persons have the intent and ability to carry out an attack.”

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