The Public Security Examination Commission has decided to keep the Aum Shinrikyo cult under surveillance for another three years, sources said.

The Public Security Investigation Agency has asked the commission to extend the surveillance period beyond Jan. 31, when the current surveillance authority lapses. It believes that the cult, which launched a fatal gas attack on the Tokyo subway system in 1995, is still a threat to the public and is capable of indiscriminate mass murder.

The commission is headed by Kozo Fujita, a former Hiroshima High Court president. It is discussing in detail its decision and is expected to make a formal decision as early as Monday. The decision will be announced in the government gazette at the end of January.