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STOCKHOLM (AFP) - Swedish Prime Minister Fredrik Reinfeldt called Saturday for people to defend democracy and respect all political views as a response to the the "inconceivable" attacks in neighbouring Norway.

"The inconceivable has hit our neighbours in Norway with the death of more than 90 people," Reinfeldt said in a statement.

"A lone suspect has been arrested for what is probably the worst violence in modern Nordic history.

In response, he said, "...we all have to stand up for what is important: respect for each other, taking care of each other, defending democracy, openness, and respecting anyone who is politically active."

Norwegian police said Saturday they had arrested a 32-year-old suspect, a Norwegian "fundamentalist Christian" with far-right views.

They suspect him of involvement in both the city centre bombing and the shootings that between them have killed at least 91 people, the worst such incident in Norway since World War II.

Sweden, which was the target of a failed suicide attack last December, took measures on Saturday to protect sensitive facilities, but the domestic intelligence service has not raised the country's terror alert level.