The second explosion targeted Shiite religious observers on a bus . The first attack occurred outside a hospital treating victims of the first blast . The second blast happened in front of the emergency room at Jinnah Hospital , where doctors treated people from the first attack and others on stretchers were waiting to be taken to the crowded facility . Motorcycles were used in both attacks , say officials . A blast in Ashura in Friday , during Ashura , killed more than 40 people .
The second explosion targeted Shiite religious observers on a bus . The first attack occurred outside a hospital treating victims of the first blast . Motorcycles were used in both attacks , say officials . A blast in Ashura in Friday , during Ashura , killed more than 40 people .