those victims identified as 21-year-old brianna benlollo and 25-year-old tyler johnson. >> right now, we don't have any type of known relationship between the shooter and our victims. not saying there's not one. we just haven't uncovered one. that's why our investigates are working very hard to uncover. >> police say they received a missing person's report from aguilar's mother two hours after the shooting. they found a journal at home that expressed general unhappiness but left no clues about the murders. the mall is expected to reopen this afternoon. >>> braulgts and record-breaking temperatures are slamming parts of the country. for the next days or so it will range from teens to below zero. minneapolis, 43 below. minus 23 in milwaukee. and chicago's public schools are closed today. hundreds of flights already canceled. that brings us to nbc's wendy wi willfolk live. >> reporter: good morning to you. this is the fourth arctic blast of the season and supposed to be the worst one yet. this part of the country has not even been able to thaw with thefy round of the polar vortex and we'