( CNN ) -- Officers in two Utah cities will make extra patrols Monday , the anniversary of the slayings of two women -- one in 2006 , the other in 2008 -- who investigators believe were killed by the same person . Sonia Mejia , left , 29 , and Damiana Castillo , 57 , were killed on the same date two years apart , police say . Investigators recently learned forensic evidence links the February 9 , 2006 , killing of a pregnant Sonia Mejia and the February 9 , 2008 , slaying of Damiana Castillo , police in two neighboring Salt Lake City suburbs announced last week . No arrest has been made . Both women were Hispanic , and both were found slain in their apartments -- one in Taylorsville and the other a mile away in West Valley City . Authorities are trying to determine whether the date is significant , but they want residents `` to be cautious in general '' and not focus just on Monday , West Valley City police Sgt . Mike Powell said . Still , police will do extra patrols Monday `` just so the public is aware we 're out and about , '' he said . Investigators are not saying a serial killer was involved , Powell said . But the links are alarming for the involved neighborhoods , which are heavily populated by Latinos , the director of a Hispanic advocacy group said . `` [ News of the links ] is important because , although I think law enforcement does n't want to say it , this could be a serial killer type of thing , and there 's concern from our point of view that there could be a guy that could be trying to kill people on a certain date , '' said Tony Yapias , director of Proyecto Latino de Utah . Mejia , 29 , was six months ' pregnant when she was sexually assaulted and strangled , CNN affiliate KSL-TV in Salt Lake City reported . She was found dead in her Taylorsville apartment , and her unborn child died , too , police said . Her car was found abandoned outside a hotel in nearby Murray , Utah , according to KSL . Some jewelry of Mejia 's is missing , Powell said . Castillo , 57 , was found strangled in her apartment two years later in West Valley City , about a mile away from Mejia 's apartment , according to CNN affiliate KTVX-TV in Salt Lake City . Her son found the body , and there were no signs of forced entry , KSL reported . Police in both cities announced on Wednesday that forensic evidence linked the slayings to one killer , and that they had reason to believe he was a Hispanic male in his late teens or early 20s , standing between 5 feet 3 inches to 5 feet 5 inches tall , weighing 135 to 150 pounds and having short black hair . Powell declined to say how investigators arrived at those details or what kind of forensic evidence linked the killings . Police have n't said whether the women knew their attacker . Investigators have n't linked the killings to any other but are `` not closing the door on anything that might be related , '' said Powell , who added he is n't aware of any other February 9 homicides in the two cities or surrounding communities in recent years . The link between the February 9 stranglings has rattled some residents in the area , KTVX reported . `` I 'm scared for me and my daughter to be here , '' West Valley City resident Elizabeth Berrelleza told KTVX . The police departments said Thursday they 've created a joint eight-member task force to investigate the killings . The departments had known about each other 's cases and had compared information for quite some time , `` but it 's just recently that we 've been able to link the cases , '' Powell said . `` [ The significance of the date ] is something that we 're looking further into , and if someone has some information that would enlighten us , that would be helpful , '' Powell said . At a news conference Thursday , the task force made a special appeal to Latinos in the area , saying anyone with information -- including any undocumented person -- should come forward without fear . `` Sometimes they 're worried about their [ immigration ] status . We 're not interested in that . Come forward regardless , '' Powell said in an interview after the news conference . Police reached out to Yapias and other leaders of Hispanic advocacy groups , Yapias said . Yapias ' group is working with Spanish-language media in the area to spread information about the killings and investigators ' request for information , he said . `` Law enforcement has assured everyone that if someone is undocumented and they have information , they just want the information , '' Yapias said . `` But if they 're afraid because of their legal status , then I or any other community leader can act as a mediator to make sure they 're going to be protected . '' Anyone with information about the slayings can call the task force 's tip line at 801-965-5121 or send an e-mail to the task force at taskforce @ wvc-ut.gov , police said .
Police : Evidence points to that happened on same date two years apart . This is one of slayings , which occurred in two Utah cities . No arrest has been made ; police question whether this is significant . Both victims were Hispanic ##s , found dead in their apartments .