Swedish authorities are interrogating a suspect arrested for plotting a "terror attack", authorities said Friday as security is tightened following last week’s carnage in Paris.

Swedish authorities are interrogating a suspect arrested for plotting a "terror attack", authorities said Friday as security is tightened following last week's carnage in Paris.

Defense Minister Peter Hultqvist told the Swedish daily Expressen that authorities were hunting for more suspects.

Mutar Muthanna Majid, an Iraqi, was arrested by police during a Thursday afternoon raid on a center for asylum seekers in the northeastern city of Boliden without incident, police said.

"We are now in a very intense stage of the investigation and we are still very interested in his activities and people he met with since arriving in Sweden," said Mark Vadasz, a spokesperson for Sapo, the Swedish security service.

Sweden has been on high alert since 129 people died in a wave of attacks in Paris on Friday that were claimed by the so-called 'Islamic State of Iraq and the Levant' (ISIL) takfiri group.

Swedish Prime Minister Stefan Lofven congratulated the security services for the "speed with which the suspect was located and arrested".

Authorities had issued an arrest warrant for 25-year-old Majid, who local media said was suspected to have fought in Syria, for preparing a "terrorist" attack.