Bangladesh on Friday announced the imposition of a curfew and the deployment of military forces after police failed to quelldays of deadly unrest that has spread throughout the country. This week’s clashes between student demonstrators and police have killed at least 105 people, according to an AFP count of victims reported by hospitals, and pose a momentous challenge to Prime Minister Sheikh Hasina’s autocratic government after 15 years in office. “The government has decided to impose a curfew and deploy the military in aid of the civilian authorities,” Hasina’s press secretary Nayeemul Islam…