The Justice Ministry is investigating a case involving a Vietnamese man brought to Japan under the government's foreign trainee program who alleges he was duped into taking part in cleanup work in areas devastated by the 2011 nuclear disaster, authorities said Wednesday.

The ministry confirmed by telephone that the officials have been looking into the case of the 24-year-old man who worked for an Iwate Prefecture-based construction firm. The company wasn't available for comment as of Wednesday.

On Tuesday, the Nikkei daily reported the firm has denied claims that it violated labor laws. In the report, the firm asserted instead that the man, who requested anonymity through the union, was assigned the same duties as his Japanese coworkers, which didn't pose any threat to workers' health.