ISLAMABAD (AP) — A bomb ripped through a fruit and vegetable market on the outskirts of Islamabad on Wednesday, killing 22 people and wounding dozens more in a new attack in the Pakistani capital, which until recently had remained relatively removed from shootings and bombings that plague other parts of the country.

Confusion over who carried out the morning blast underlined one of Pakistan’s central woes — the sheer number of armed groups waging violence for multiple motives.