From AP via International Herald Tribune:
A roadside bomb in southern China killed two children who found the explosive wrapped in a package and began playing with it, Hong Kong news organizations reported Thursday.
Before the explosion, which occurred Wednesday in Shenzhen, residents said that they had received threatening phone calls, and the police said that the attack might be related to an unspecified grievance in the neighborhood, one newspaper, Ming Pao Daily, reported.
Ming Pao Daily said that three boys found the bomb in a roadside flower bed and that they were playing with it when it exploded in Shenzhen, which is next to Hong Kong. The two children who died were 5 and 8 years old, and a 9-year-old boy was taken to a hospital for treatment of his wounds, the newspaper said.[Full Text]
See the original Ming Pao report (in Chinese) here.