Three Hazara Shias were killed in a sectarian drive-by shooting in Quetta on Monday, police officer Zakir Ali said. No further details were available of the attack. Dozens of minority Shia Muslims have been killed in months of violence across Pakistan, often brutally. Bomb blasts and attacks on police and security forces are frequent across Balochistan, which is also a flashpoint for sectarian violence involving majority Sunni and minority Shia Muslims that has left thousands dead since the 1980s.