A driver sped into pedestrians in a busy intersection in the southern Chinese city of Guangzhou, killing at least five people and injuring more than a dozen others, according to the police and videos posted online. Officers arrested a 22-year-old man and were trying to determine a motive, according to the city’s public security bureau. Videos appeared to show the driver throwing money into the air after hitting the people and before being apprehended. The incident, which took place on Wednesday during the afternoon rush hour, set off shock and…