OSLO, July 29 (Reuters) - Norwegian Anders Behring Breivik probably acted alone in massacring 77 people last week and the killings have not raised risks of new attacks in Norway, the Norwegian Police Security Service said on Friday.
"It is most likely that the perpetrator planned and carried out the actions with no support from others," it said in a report, saing the bombing and shootings were "unique both in a national and international context."
"The terrorist acts bring no increase in the threat from konwn extreme right- or left- wing groups in Norway," it said after reviewing the killings by Breivik, a right-wing anti-Islam zealot.
(Reporting by Alister Doyle)
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