One person has been killed and two others hurt in a busy street in Stockholm, Sweden by two blasts, believed to be a failed terrorist attacks, CNN reported.

The first blast was a car that blew up near a busy street and another blast, which is believed to be committed by a suicide bomber, followed minutes later.

The Swedish police said no cause had yet been determined for the suicide bombing.

“Most worrying attempt at terrorist attack in crowded part of central Stockholm. Failed – but could have been truly catastrophic,” Swedish Foreign Minister Carl Bildt said in a Tweeter message on Saturday.

Swedish news agency and police said they received e-mal threats against Swedish people 10 minutes before the explosions late Saturday.

“We have not taken any decision to increase the terror threat level. And apart from the e-mail, we didn’t have any other indications or threats that this would happen,” said Security Police spokesperson, Mikael Gunnarsson, as cited by CNN.

According to the local news agency, TT, the e-mail mentioned the Swedish troops in Afghanistan and the Swedish cartoonist Lars Vilks, who depicted the Prophet Mohammed as having the body of a dog. It also contained sound files of a person speaking in Swedish and Arabic.

“Now your children, daughters and sisters will die like our brothers and sisters and children are dying,” the e-mail said, according to TT.

“Our actions will speak for themselves. As long as you don’t end your war against Islam and the humiliation against the prophet and with your stupid support to Lars Vilks the pig,” the person said in the attached audio file.

The two explosions occurred on busy streets with Christmas shoppers. An unidentified man was found dead at the scene of the second blast.

“We don’t know at this point what caused the second explosion,” the police spokeswoman Petra Sjolander said, as cited by CNN.

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