Pakistan's interior minister says police have made a breakthrough in the case of last week's Karachi bus attack that killed 47 Shiites, and arrested the suspected mastermind and several gunmen. Chaudhry Nisar Ali Khan made the announcement in Islamabad Wednesday. He did not say when the arrests were made or provide the affiliation of the gunmen. Both a Pakistani militant group linked to ISIS, which is fighting in Iraq and Syria, and a Pakistani Taliban splinter group have claimed responsibility for the May 13 assault. Khan says some of the arrested men confessed to taking part in the attack during which gunmen stormed a bus with the Shiites, forced them to bow their heads, then shot and killed 47 members of the Ismaili Shiite branch.
