ISLAMABAD: The Interior Ministry has cancelled the visa of the South Korean owner of Urdu Academy in Quetta, sources said on Friday. The sources said that it has established during the investigation into the kidnapping of the Chinese pair that the Korean national had arrived in Pakistan on a business visa but he established Urdu Academy and had been involved in illegal activities. It has also been revealed that the police had taken the Chinese nationals into custody from Kharot Abad area of Quetta some time ago. The police had not only warned them about security but offered them security. But the Chinese nationals had refused to take security, the sources said. The security and intelligence agencies are investing all aspects of the incident and are in the process of verification of the photographs of the Chinese nationals on the social media to reach conclusion and verify whether or not the Chinese pair has been killed, the sources further said.