NEW : Turkey says it has taken over five Kurdish villages in two days . U.S. official says it will take time to identify and vet Syrian ##s who will take part . Kurdish officials warn of humanitarian crisis without international help . Turkey opens border for Kurdish refugees in northern Syria .
NEW : Group says ISIS has taken over 60 Kurdish villages in three days . U.S. official says it will take months to train and vet Syrian rebels who will take part . Kurdish leaders warn of humanitarian crisis without international help . Turkey opens border for Kurdish refugees in northern Syria .