Police fired pepper spray to disperse protesters outside a rally by U.S. President Donald Trump in Phoenix, Arizona, on Tuesday after being pelted with rocks and bottles, police said. Police have not given an estimate of the number of protesters, but Arizona media said there were several thousand. Police did not say whether the pepper spray was used on pro- or anti-Trump protesters, or both. "People in the crowd have begun throwing rocks and bottles at police," Phoenix Police Department spokesman Sergeant Jonathan Howard said. "Police have responded with pepper balls and OC (oleoresin capsicum) spray in an attempt to...