ISLAMABAD — Thousands of Shi’ite Muslims staged protests across Pakistan on Monday, demanding that the government and military protect them from Sunni extremists behind a bombing that killed 89 people Saturday in the southwestern city of Quetta.

Shi’ites, a religious minority in Pakistan, pointed to the attack, which followed a similar devastating bombing in January, as further evidence of Islamabad’s indifference to what many describe as a pogrom against Shi’ites in Baluchistan Province.