Swedish police said Sunday they were investigating two bomb blasts that hit Stockholm’s city center 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 said.

Two blasts rocked the Swedish capital Saturday in a possible attack inspired by anger over Sweden’s presence in Afghanistan. One person died and two people were injured. Local media had received an email with threats shortly before the blasts.