Palestinian security forces have launched a rare crackdown against local militant groups in the northern West Bank, engaging in fierce gunbattles that have killed at least two people. The raid marks an unusual step for the Palestinian Authority, which has largely lost control of militant strongholds such as Jenin. Israeli troops have stepped into the vacuum in recent years. The U.N. humanitarian office said that security forces took over part of a hospital in Jenin, using it as a base and shooting from inside. The main U.N. agency for Palestinians, UNRWA, suspended its services, including schooling.