( CNN ) -- A failed terrorist attack in a central Stockholm district full of Christmas shoppers could have been catastrophic , Swedish authorities said late Saturday . Police are investigating whether two explosions in Stockholm , an e-mail threat sent shortly before the attack that mentions Afghanistan and the body of a man who was apparently killed in one of the explosions are related . `` 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 Twitter message on Saturday . A Swedish news agency and police said they received e-mail threats against the Swedish people 10 minutes before the explosions , which killed one person and injured two others on Saturday . `` We have not taken any decision to increase the terror threat level , '' said Swedish Security Police spokesman Mikael Gunnarsson . `` And apart from the e-mail we did n't have any other indications or threats that this would happen , '' Gunnarsson added . The writer of the e-mail mentions the presence of Swedish troops in Afghanistan and a Swedish cartoonist who depicted the Prophet Mohammed , according to TT , a Swedish news wire . The e-mails contained sound files featuring a person speaking in Swedish and Arabic , TT reported . The sender referred to Swedish silence regarding the Afghanistan troops and the controversial cartoon by Lars Vilks that depicted Mohammed as having the body of a dog . `` Now your children , daughters and sisters will die like our brothers and sisters and children are dying , '' the e-mail states , according to TT . `` Our actions will speak for themselves , '' the person said in an audio recording attached to the email . `` As long as you do n't end your war against Islam and the humiliation against the prophet and with your stupid support to Lars Vilks the pig . '' Swedish terrorism expert Magnus Ranstorp told CNN that he did not believe the attacker acted alone . `` This was not something where he just woke up and thought that he would blow himself up , '' said Ranstorp , a professor at the Swedish military academy and a former professor in terrorism studies at the University of St. Andrews in Scotland . Police said the explosions were in a popular pedestrian shopping area . `` One explosion happened at the intersection of Drottninggatan and Olof Palmes Gata , '' two busy streets in central Stockholm , said police spokeswoman Petra Sjolander . `` This was the car that exploded multiple times . '' A second explosion occurred about five minutes later , at the intersection of Drottninggatan and Bryggargatan streets , Sjolander said . An unidentified man was found dead at the scene of the second blast . `` We do n't know at this point what caused the second explosion , '' Sjolander said , describing it as suspicious . A bag was found near the body , she said . `` We had bomb technicians on site , but I ca n't give you any details of what they did , '' Sjolander told CNN . A bomb robot rolled up to the body and removed the bag for examination , according to the Swedish newspaper Dagens Nyheter . In the first incident , multiple blasts went off in a car , according to Sjolander . `` It is likely that this was some kind of gas tubes that have caused the car to explode multiple times , '' she said . Two people at the site of the car explosion were taken to the hospital with minor injuries , she said . Video on Sweden 's TV4 showed flames spewing from the car , which was parked behind several others . The e-mail writer ended the message with a call for action `` to all Mujahadeen in Europe and Sweden , '' TT said . `` Now is the time to strike , do n't wait any longer , '' the message read , according to TT . `` Step up with whatever you have , even if it is a knife , and I know you have more than a knife . Fear no one , fear not prison , fear not death . '' TT said that it was not clear from the e-mail or the audio files if the person belongs to any specific organization . The person claimed to have been to the Middle East and asked family for forgiveness for lying to them . `` I did n't go to the middle east to work , '' the writer wrote . `` I went there for jihad . ''
NEW : Dead body has not been formally identified . Pakistan : Police say they received email just before explosion . Pakistan 's Prime Minister said incident was terrorist attack . 1 is dead , 2 are injured in explosions .