Government agencies and major companies opted to double check various computer systems Wednesday after it was discovered that some of the the software may have been developed by a firm controlled by Aum Shinrikyo.

A Ground Self-Defense Force communications system was not put into scheduled operation Wednesday after it was revealed that the firewall of the software in question was made penetrable in its development stage.

Member firms of the Nippon Telegraph and Telephone Corp. group have announced that they will stop using computer-system software allegedly developed by firms linked to the Aum Shinrikyo cult if the reports are confirmed, NTT said Wednesday.