Context: Reporters in Chengdu said they saw cracks on walls of some residential buildings in the downtown areas, but no buildings collapsed. Many Beijing office towers were evacuated, including the building housing the media offices for the organizers of the 2008 Summer Olympics. None of the Olympic venues were damaged. Meanwhile, a cargo train carrying 13 petrol tanks derailed in Hui County, Gansu, and caught on fire after the rail was distorted.

Question: Where did the reporters say they saw cracks on walls of some buildings?
Answer: in Chengdu

Question: Where were office towers evacuated?
Answer: Beijing

Question: Where did a cargo train derail as a result?
Answer: Hui County, Gansu

Question: What happened to the cargo train?
Answer: caught on fire

Question: What was reported in Chengdu?
Answer: cracks on walls

Question: What was evacuated in Beijing?
Answer: office towers

Question: What part of the Olympic area was not damaged?
Answer: venues

Question: Where did a cargo train derail?
Answer: Hui County, Gansu

Question: Why did the train catch fire?
Answer: rail was distorted