Investigators probing alleged bid-rigging involving test events for last year's Tokyo Olympics and Paralympics have raided more targets, including two group companies of major Japanese advertising agencies.

Tokyo prosecutors and the Japan Fair Trade Commission on Tuesday searched the offices of ADK Marketing Solutions and Dentsu Live, and other locations.

Investigators have raided the offices of two major ad agencies, Hakuhodo and Tokyu Agency, over alleged bid-rigging involving test events for the Tokyo Olympics and Paralympics.

Tokyo prosecutors and the Japan Fair Trade Commission also searched two other firms on Monday.

The Tokyo Olympic and Paralympic organizing committee is believed to have played an active role in alleged bid-rigging involving the Games' test events.

Sources told NHK that the committee asked major ad agency Dentsu to compile a list of potential bidders for the events.

Authorities have raided Dentsu, one of Japan's major ad agencies, over alleged bid-rigging involving test events for the Tokyo Olympic and Paralympic Games.

Tokyo prosecutors and the Japan Fair Trade Commission searched Dentsu's head office and an event-organizing firm, both in the capital, on Friday.

Sources say the Tokyo Olympics and Paralympics organizing committee may have been involved in alleged bid-rigging over the Games' test events.

They say the committee is suspected of having created in advance a list of advertising agencies and other firms that had previously carried out similar duties for each sports event.

Our ‘Used Cars' category is, more often than not, filled with expensive models, most of which we would buy if we could afford the asking price and/or running costs.