During a Press conference held in Swedish capital Stockholm, SAPO chief Anders Thornberg said an arrest warrant has been issued for the suspect.
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Sweden raised its terror threat level to high for the first time in the country’s history Wednesday after “concrete information” pointed to a terrorist plot.
Mr Thornberg told reporters: “We’re at an intensive operative stage and are working to analyse the information”.
“The decision is based on an assessment by the National Centre for Terrorist Threat Assessment (NCT) which is responsible for conducting threat assessments for Sweden and Swedish interests overseas”, intelligence service 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”.
“One of the reasons for the heightened level is that Sapo has received concrete information and considers that we must act within the framework of our counterterror work”, it said.
Sweden also raised its threat level several hours after Denmark, to “high”, also the second-highest level.
The agency said it had raised the alert to level four of five possible graduations.
Prosecutors have opened a preliminary investigation into a possible terrorist offence.
“The man is being actively searched for”, Thornberg said, refusing to confirm media reports the suspect is an Iraqi who has fought in Syria.
It did not elaborate but a news conference was planned for later Wednesday.
French special police forces arrive at the scene as shots are exchanged in Saint-Denis, France, near Paris, November 18, 2015, during an operation to catch suspects in the deadly attacks in the French capital.
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The Norwegian Police Security Service (PST) would not comment on what intelligence it had been given by its Swedish counterparts.
