Stockholm , Sweden ( CNN ) -- A suspected serial shooter is keeping a city in southern Sweden on edge . Police say as many as 15 shootings in Malmo over the last year may be linked to a single perpetrator who is targeting immigrants living in the city . Investigators have no suspects . The shootings have all been well planned , under the protection of darkness and at places familiar to the shooter , according to CNN 's Swedish affiliate TV4 , citing police . Several of the shootings have occurred in recent weeks , police say . On Thursday evening , two immigrant women were wounded when shot through their apartment window . `` I 'm almost afraid of turning on the light in my apartment at night now , '' Shukrije Berisha , who lives in the same building , told the Swedish daily Svenska Dagbladet . In similar incidents , two men of an `` ethnic minority background '' were recently shot while waiting at bus stops , according to police . One of them `` was lucky to be alive after being shot in the torso , '' Malmo police superintendent Hans Nilsson told CNN . `` The shooter was most likely waiting in the bushes before firing his weapon , '' Nilsson said . Victim Basi Hassan told TV4 , `` I was standing here at the bus stop when I suddenly heard a shot . I do n't know where it came from . Then I saw my own blood and I started feeling dizzy . '' The latest report of a shooting came late Friday evening , when a male immigrant reported he was shot at while riding his bicycle . The Swedish National Murder Commission and the Swedish National Criminal Police have launched a major operation together with local police to find the gunman . A group of psychologists is trying to profile the shooter 's behavior before , during and after the attacks . Police have also increased the number of officers and K-9 units patrolling the city . In Malmo , where nearly a third of the residents are immigrants , many now fear for their safety . One 17-year-old girl , identified only as Fatima , told TV4 that she refuses to go to school by bicycle or bus and will only travel by car now . `` I could n't sleep last night . I just could n't stop thinking about it , '' she said . The shootings also bring back memories of Sweden 's `` Laser-man , '' a shooter who was targeting immigrants in Stockholm in the 1990s with a laser-aimed rifle . `` We have n't had anything this big here in Sweden since the Laser-man was around , '' Nilsson said . The recent slew of shootings has also prompted a mobile phone text message that has circulated among Malmo 's youth . According to Nilsson , the text states : `` A killer is loose in Malmo so stay indoors . '' `` We are very clear that we are not behind this text message , but we can also understand that people are worried , '' he said . Malmo Mayor Katrin Stjernfeldt Jammeh says she is angered by the shootings . `` It is awful that people should have to be worried and feel fear for walking our streets , '' she said .
Shooter targeting immigrants , police say . 15 cases could be linked to unknown shooter . Comment: