In an interview with The Japan Times, Tokyo Gov. Yuriko Koike stressed the need to scrutinize the contamination problem at Toyosu, the relocation site for the famed Tsukiji fish market, following revelations that more toxins have been found there.

Cancer-causing benzene at 79 times the maximum concentration allowed was detected at the site in the final groundwater sampling conducted under a two-year monitoring survey, the Tokyo Metropolitan Government said last week.

"Given that high levels (of toxins) have been detected in the last two samplings, I think we should re-examine the site," Koike said during the interview Monday at the metropolitan government building in Shinjuku Ward.