A suicide attack in Stockholm last weekend - the first ever in the Scandinavian country - was condemned at Friday prayers held at the main mosque in the Swedish capital, reported dpa.
The only fatality in the Saturday blasts near a busy shopping district was a 28-year-old Swedish man of Middle Eastern descent, while two bystanders were injured.
The Islamic Federation of Sweden (IFIS) also said that Muslims with "one voice" rejected the attack, which was "condemned by imams and representatives of various Muslim organisations."
The act was "unacceptable" and only created "more difficulties for Muslims especially, as well as society as a whole," according to the statement distributed to other mosques around the country.
Security police probing the blast were seeking to track the man's movements prior to the blast and have not ruled out that he had accomplices.
Police were considering a theory that he moved to a less crowded side street after he experienced some difficulty with his explosives, and then was killed when he accidentally detonated them.
Stockholm daily Expressen Friday published CCTV images that appeared to show the suspected bomber just minutes before the blast.
The man was seen walking on the crowded street, and then retracing his steps onto a side street, just out of the CCTV camera's range.
Security police have not confirmed it was the man, but said they were studying the images.
Media reports have also emerged that the man recently contacted car paint shops in the small town of Tranas, southern Sweden - where he used to live - and tried to obtain material that is often used to manufacture bombs.
US explosives experts from the Federal Bureau of Investigation (FBI) are assisting Swedish police. At a news conference Thursday, police said they were pretty sure what explosives were used.
The man also lived in Luton, near London.