Columbia University students who inspired pro-Palestinian demonstrations across the country say they have reached an impasse with administrators and intend to continue their encampment until their demands are met. The announcement Friday after exhaustive negotiations comes as Columbia’s president faces harsh criticism from faculty. Hundreds of protesters have been arrested across the nation, sometimes amid scuffles with police. Other schools have been quick to call law enforcement to douse demonstrations before they can take hold. Columbia officials have said they will seek other options if the negotiations with protesters fail.