Pakistani authorities imposed a curfew in a remote northern town on Saturday after rioting erupted following an attack on a minority Shi'ite Muslim leader, officials said. Shi'ite leader Ziauddin Moosavi was travelling in his car to a mosque in the centre of Gilgit, a town 240 km (150 miles) north of the capital Islamabad, when unidentified gunmen opened fire at him, critically injuring him and his two guards. The attack enraged Shi'ite Muslims who went on rampage after the attack and set government buildings and cars on fire. A local official said the curfew had been imposed and army had been called out to quell violence. No one claimed responsibility for the attack but police suspected it was a sectarian incident.