About 300 people have been arrested during police crackdowns on protests at US universities. In the early hours of Wednesday, police were called into Columbia University in New York, and also broke up protests at the University of California, Los Angeles (UCLA) as demos over the Israel-Hamas war reached boiling point. New York City Mayor Eric Adams said about 300 people were arrested at Columbia and nearby City College. Columbia's Hamilton Hall was occupied by protesters and Mayor Adams said this particular group was "led by individuals who were not affiliated with the university". "There is a movement to radicalize...