The organizing committee for the Tokyo Olympics has become the latest to be hit by a data breach through unauthorized access to an information-sharing tool developed by Fujitsu Ltd., sources familiar with the matter said Friday.

Personal information was leaked from a total of about 170 people who are involved in security management and have participated in a drill hosted by Japan's national cybersecurity center to brace for potential cyberattacks during the sporting event, the sources said.

Data breaches have already been found in government agencies including the National Center of Incident Readiness and Strategy for Cybersecurity and the Foreign Ministry, Fujitsu and the affected ministries said in late May.