The source of the interfering signals could not be conclusively established as the incidents subsequently stopped.
Investigation into those incidents assessed that an interfering signal could have disrupted the communications. Preliminary investigations by LTA and SMRT indicate that the nature of the faults could be similar to that of the incidents that occurred on the CCL in September this year. The Circle Line (CCL) experienced intermittent loss of signalling-related communications this morning that led to multiple delays of train services at various locations within the network. News Releases Joint Statement by the Land Transport Authority (LTA) & SMRT - Temporary Suspension of Mobile Communication Services on Circle Line
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