PHILADELPHIA — A half-dozen University of Pennsylvania students were among 19 pro-Palestinian protesters arrested during an attempt to occupy a school building, university police said Saturday. Their arrests came a week after authorities broke up a protest encampment on campus and arrested nine students — and as other colleges across the country, anxious to prepare for commencement season, have either negotiated agreements with students or called in police to dismantle protest camps. [time-brightcove not-tgx=”true”] Members of Penn Students Against the Occupation of Palestine announced the action Friday at the school’s Fisher-Bennett Hall, urging supporters to bring “flags, pots, pans, noise-makers, megaphones” and other items, the University of Pennsylvania Division of Public Safety said in a news release. Officers could be seen closing in “within the hour,” The Philadelphia Inquirer reported.