Police on Tuesday issued fresh warrants for the arrests of two men over the alleged murder of a couple whose burned bodies were found in Tochigi Prefecture.

The arrests come days after two others were arrested on the same charges.

Kang Gwang-gi, a 20-year-old South Korean national whose occupation is unknown, and Kirato Wakayama, a 20-year-old former actor, were arrested over the alleged murder of businessman Ryutaro Takarajima, 55, and his wife Sachiko, 56. The two had already been arrested for torching their corpses.