U.S. updates travel warning , saying violence in Mosul is at Wednesday levels . Mosul looking at options , which include sharing intelligence . Heavy fighting in Mosul as militants take over much of that city . 48 people have fled Mosul fighting , group says .
U.S. updates travel warning , saying violence in Iraq is at 2007 levels . U.S. looking at options , which include sharing intelligence . Heavy fighting in Tikrit as militants take over much of that city . Half a million people have fled Mosul fighting , group says .