The ruling Hamas militant group launched a crackdown Tuesday on radical Salafi groups following a series of unclaimed bombings in the Gaza Strip, arresting dozens of people and setting up military-type checkpoints.

Hamas, an Islamic militant group that has ruled Gaza for the past eight years, considers the more radical Salafists, who identify ideologically with the Islamic State group, a threat. The Salafists, believed to number several hundred, seek the establishment of an Islamic caliphate and accuse Hamas of being too soft on Israel and failing to adequately impose religious law.

On Monday morning, a bomb damaged a wall at a security site run by Hamas’ armed wing. There were no casualties, but after a series of similar blasts on Hamas security posts in recent weeks, suspicion fell on the Salafists. […]