A restaurant that was being built suddenly exploded, causing a wall collapse that killed one in southern China.br br CCTV video filmed in Yunfu City in Guangdong Province on July 20 shows the restaurant wall on the second floor of a mall suddenly collapsing and hitting several passers-by after the explosion.br br According to local reports, the explosion was caused by a gas leak.br br One person was killed and 12 were injured. Two people in charge of the restaurant and one supervisor of the construction site were arrested.