The following are stories and questions about them. Each story is followed by a question and answer to a given question.

Story: (CNN) -- Five blasts went off in the Nigerian city of Jos Friday night as residents were celebrating Christmas Eve, leaving 31 dead, a regional government official said. 

Choji Gyang, a special adviser to the governor of Nigeria's Plateau state, said two bombs went off in the Angwa Rukuba area of Jos. Within five to 20 minutes, three more blasts happened in the area of Kabong, he said. 

"We have a lot of casualties and are struggling to cope," Gyang said. 

Hassan John, a Jos resident and journalist with the media department of the Anglican Diocese of Jos, had just come out of church about 7 p.m. (1 p.m. ET) when he heard the sound of the first explosion. He rushed to the site, which he described as a beer parlor frequented by locals. 

"By the time I got there, there were women crying, people screaming. It was all chaos, people were screaming, blood everywhere." 

"I counted eight corpses all over, seven in the building," John said. He added that a second blast went off within a couple of minutes after the first one. "We cannot say if there are more bodies under the rubble because it was dark," John said. 

Gyang, who is special adviser on religious affairs to the governor, said it was unclear who set off the blasts or whether they were related. 

"It was Christmas Eve, lots of activities was going on. People were still preparing for Christmas, lots of people were coming into town. A blast went off, those around the area -- some were killed, some injured and the houses and cars caught fire," Gyang said. He said he received reports of "a lot of dead bodies." 

Question: Did bombs go off?
Answer:Yes

Question: Where?
Answer:Nigerian city of Jos

Question: When?
Answer:Friday

Question: During the holiday?
Answer:Christmas Eve

Question: Were there casualties?
Answer:Yes

Question: How many?
Answer:31

Question: Who's saying all this?
Answer:Choji Gyang

Question: Who is that?
Answer:a special adviser

Question: to whom?
Answer:Governor of Nigeria's Plateau state

Question: Who is responsible?
Answer:It was unclear.

Question: Were there witnesses?
Answer:Yes

Question: What did they witness?
Answer:Heard the sound of the first explosion

Question: Who heard it?
Answer:Hassan John

Question: Who is that?
Answer:A Jos resident and journalist

Question: Where does he work?
Answer:Anglican Diocese of Jos

Question: What did he do?
Answer:He rushed to the site

Question: Where was it?
Answer:a beer parlor frequented by locals

Question: What did he see?
Answer:
Women crying, people screaming.