Islamabad, Pakistan (CNN) -- The death toll has risen to 33 in Friday's twin blasts in Karachi, authorities said Saturday.





One blast targeted a bus filled with Shiite religious observers, killing scores. Another explosion in front of a hospital where attack victims were being treated, a government official said.





Along with the the deaths from both blasts, more than 160 people were injured, the government official said.





Motorcycles were used in both assaults, police said, and they came during the Shiite observance of Arbaeen, which takes place 40 days after the anniversary of Iman Hussein's death, also known as Ashura.





Along with the fatalities, 69 people were injured in the first blast, said Dr. Saghir Ahmed, Sindh provincial health minister.





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. Along with the 13 killed, 92 were injured.





The last deadly blast in Karachi was in late December during Ashura, when more than 40 people were killed.





-- CNN's Nasir Habib contributed to this report
What do officials say were used in both attacks? Where did the December blast occur? what was used in both attacks? What form of transport was used in both attacks? How many attacks were there? What did the first explosions target? How many people were killed? where did the second attack occur?
Motorcycles in Karachi, Motorcycles Motorcycles twin blasts a bus filled with Shiite religious observers, 33 Jinnah Hospital,
question: What do officials say were used in both attacks?, answer: Motorcycles | question: Where did the December blast occur?, answer: in Karachi, | question: what was used in both attacks?, answer: Motorcycles | question: What form of transport was used in both attacks?, answer: Motorcycles | question: How many attacks were there?, answer: twin blasts | question: What did the first explosions target?, answer: a bus filled with Shiite religious observers, | question: How many people were killed?, answer: 33 | question: where did the second attack occur?, answer: Jinnah Hospital,