good morning to you all. i'm t.j. holmes. >> i'm kayna whitworth in for reena ninan. here are some of the top headlines that we're following this morning on "world news now." first of all, a shooter on the loose. police in northern colorado are trying to determine if they have a serial shooter on their hands after a man was gunned down on the street. could it be linked to two earlier attacks? we have a full report coming up. >> also a batch of tornadoes has damaged dozens of homes across colorado. storm chasers captured the massive twisters as they descended on a town near denver accompanied by hail stones and heavy rain. the wild weather is not over. >> an advisory panel has given the green light to the so-called viagra for women but concern about its serious side effects including fatigue and low blood pressure could keep it from final approval in august. >> and the golden state warriors dominated overtime last night