Japan and Britain have been discussing the handover of three Britons who fled Japan after allegedly robbing a jewelry store in Tokyo of items worth ¥106 million ($964,000) in 2015, investigative sources said Tuesday, which could lead to the first time fugitives are received from a country with which Japan has not signed an extradition treaty.

Although the three men are not thought to be in police custody, British authorities may have information as to their whereabouts, the sources said.

At present, the Japanese government only has an extradition agreement with the United States and South Korea.