After 9/11 Drama of Twin tower, 10/10 London bomb now the attack in Stockholm on 12/11 played another drama for Propaganda against Islam .  If you carefully watch the events before and after the bomb in Stockholm only a dumb person  cannot connect the dots that this is a straight drama played by Swedish counterpart.

From many other reason one tactics would be to divert peoples attention from WikiLeaks and other injustice from West.