YUEYANG, Hunan, Jan. 13 (Xinhua) -- A four-month investigation helped police rescue five kidnapped children and apprehend 13 suspects in their abductions, the Yueyang Public Security Bureau said Tuesday.

    All five, including one girl, are from migrant workers' families. The exact dates of all the rescues weren't given, but the final child was freed Jan. 10, police said.

    The five were among several children aged two to three years who were kidnapped in broad daylight by motorcyclists in September, causing fear among local people, especially migrant workers with very young children. Police said they don't know exactly how many children were kidnapped.

    The Yueyang police set up three special investigation teams headed by the public security bureau director. The officers crossed seven provinces, including Sichuan, Hubei, Fujian and Yunnan, in the effort to rescue the children.

    Police made their first arrest on Dec. 31, when they apprehended Su Tonghua, a 21-year-old male suspect. They caught 12 alleged accomplices between Jan. 5 and Jan.10.

    The police said that most of the gang members had criminal records.