Here in New York, police officers in riot gear arrested nine people at Barnard College Wednesday after student protesters occupied the school’s main library to demand administrators divest from the Israeli economy and grant amnesty to three students expelled for joining pro-Palestinian protests on campus. The students declared Barnard’s Milstein Center the “Dr. Hussam Abu Safiya Liberated Zone.” The arrests came after Barnard reported a bomb threat at the library; protesters said the threat was “manufactured” by Barnard administrators and pointed out that police brought zip-tied students back inside the library even as the bomb threat remained active. No other buildings were evacuated.