OTTAWA, Aug 24 (Reuters) - Canada's corporate ethics watchdog on Thursday announced investigations into the Canadian units of Walmart and Hugo Boss to probe allegations of Uyghur forced labor in the companies' supply chains and operations.

The Canadian Ombudsperson for Responsible Enterprise (CORE) said it had published an initial assessment report after complaints filed by a coalition of 28 civil society organizations in June 2022.

CORE will also investigate the Canadian unit of fashion firm Diesel, which is owned by Italy's OTB. It has already launched probes into Nike Canada, Dynasty Gold and Ralph Lauren.

"As mediation between the parties is not currently an option, we will be launching investigations into the allegations outlined in these reports," Sheri Meyerhoffer, CORE's Ombudsperson, said in a statement.

None of the three companies were immediately available for comment. CORE said all three denied the allegations.

In March, a U.N. committee said it was concerned about China's treatment of its Muslim minority, including the use of forced labor against Uyghurs. China denies the allegations.

CORE was launched in 2019 to monitor and investigate human rights abuses, mainly by Canadian garment, mining and oil and gas companies operating abroad. (Reporting by David Ljunggren; editing by Jonathan Oatis)