Toyota Motor's small car unit Daihatsu Motor has decided to halt production at all its domestic plants until the end of January, the Nikkei business daily said on Friday, without citing sources. Following the Nikkei report, a Daihatsu spokesperson said the company was still holding discussions about the matter internally. The small car specialist said on Wednesday it would halt shipments of all of its vehicles after a safety investigation found issues involving 64 models, including almost two dozen sold under Toyota's brand.