a man on the hood, a driver speeding up to 70 miles an hour. the police officer charged tonight. a woman officer shot in the chest and killed in his home. investigators say they were playing a form of russian roulette. the measles. the public health emergency now declared tonight. and authorities say there is a common link. runs against trump? the former ceo of starbucks floats a possible run. the fierce reaction. kamala harris and the crowd of 20,000. and the headline involving hillary clinton. and breaking now, how close is robert mueller what we've just learned. good evening as we come on the air with this west coast edition of "world news tonight." and we do begin with breaking news this evening. that horrific scene unfolding in houston at this hour. the images coming in right now. authorities say at least five police officers have been shot. the officers coming under fire. they were reportedly serving a narcotics warrant. we have new reporting at this hour on the suspects and those