[originaltext] Hundreds of emergency workers carefully searched the site of

Hundreds of emergency workers carefully searched the site of a five-story apartment building in southern Ukraine Thursday after a series of explosions reduced it to crushed stone, authorities said. The explosions Wednesday night in the Black Sea resort town of Yevpatoria left at least 17 people dead and 24 others missing, according to Igor Krol, a spokesman for the Ukraine’ s Emergency Situations Ministry. 21 people have been rescued. "We are now finding all possible reasons for the explosions," Krol said. Volodymiyr Shandra, Ukrainian Emergency Situations minister, told local media that oxygen bottles could have caused the explosions. Television footage showed rescuers trying to free people buried under fallen remains, while others scrabbled through wires, construction rods and stones.
3. Which of the following details in the news is correct?
4. How many people were rescued from the apartment building?