Swedish police said on Sunday they were investigating two bomb blasts that hit Stockholm's city centre on Saturday night as "terror crimes", and they had established good leads in the probe. "We are investigating this as terror crimes according to Swedish law. We are still investigating the case. In this situation, we have not raised the security (threat) level," Security Police official Anders Thornberg was quoted as saying by Reuters. Two blasts rocked the Swedish capital on Saturday. One person died and two people were injured.