(CNN) -- Some thought it was a bomb. Others thought it was the commuter train that runs behind their buildings jumping the tracks.

It shook upper Manhattan for blocks -- and when it was over, a five-story apartment building and its neighbor were gone.

After Wednesday morning's deadly building explosion in East Harlem, squads of firefighters dug through piles of shattered bricks and beams. Ladder trucks sprayed water into the gap where the buildings once stood. As Detective Martin Speechly, a New York police spokesman, put it: "1644 Park Avenue appears not to be there anymore."

Along with that five-story apartment building, with a Latino evangelical church on the first floor, a neighboring piano store and the four floors above it collapsed in the blast.

One nearby resident, Angelica Avila, told CNN she was trapped in her apartment down the block for a short time afterward. Her stepmother had to sneak in through the back to try and open the door for her, she said.

"My neighbors came banging on my door. I guess they were evacuating the building, and I couldn't get out -- my door was jammed," she said. "Everything off my windowsill fell, and I guess the impact of the explosion jammed the door as well."

Something similar happened to Aisha Watts, who had just returned to her apartment in one of the adjoining buildings after taking her children to school. Then the windows broke out, and "the walls came tumbling down," Watts said.

A neighbor helped her out of her apartment, because the door was stuck in its frame. And she and her neighbors will have to find someplace else to stay temporarily.

Based on the article and the following list of answers, write a list of questions.

1. an apartment building
2. 1644 Park Avenue
3. a Latino evangelical church
4. five
5. yes
6. a piano store
7. morning
8. Wednesday
9. East Harlem
10. yes
11. Angelica Avila
12. down the block
13. her door was jammed
14. Her stepmother
15. took her children to school
16. yes
17. A neighbor
18. yes
19. yes
1. What building was destroyed?
2. Located at what address?
3. What did it house on its first floor?
4. How many stories did it have all together?
5. Was its adjacent building also damaged?
6. What type of store was located there?
7. What time of day did the blast occur?
8. On what day of the week/
9. What neighborhood were the buildings located in?
10. Were nearby residents trapped inside of their homes?
11. Who spoke to CNN about her experience?
12. How far was she from the blast?
13. Why couldn't she evacuate?
14. Who ultimately freed her?
15. What had Aisha Watts done that morning before she returned home?
16. Was her door also jammed shut?
17. Who helped her exit?
18. Will she and other residents be relocated?
19. Did anyone die in the explosion?