It said a faulty west-bound train had stalled at Joo Koon station on the system's East-West line at 0818 AM.
A collision was reported at 8am this morning, 15 November, when a stationary train was hit by an SMRT train at the Joo Koon MRT station.
Transit operator SMRT said 23 passengers and two staff suffered light to moderate injuries and have been taken to hospital. A second train stopped behind the faulty train at the station at 0819 AM but moved forward unexpectedly a minute later, coming into contact with the stationary train.
The Singapore Civil Defence Force said they were alerted to the incident at 8.33am and had sent 23 injured passengers to hospitals. Passengers were treated for head injuries, spinal injuries, fractures and minor bruises among other injuries.
The SMRT also required station masters to inspect the platform tracks for oil.
According to Channel NewsAsia, a signaling fault caused delays on the Circle Line, which made trains congested and huge crowds seen at an interchange station.
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The worst glitches occurred in December 2011, delaying more than 200,000 people in the last weekend before the Christmas holiday, and led to the resignation of SMRT's chief executive officer at the time.
A commuter, Mei Anne posted on her Facebook page saying that she was on the train which collided with the other train.
SMRT and LTA are investigating the incident.
That incident, a front-to-back collision between two trains at Clementi station on August 5, 1993, resulted in 156 injured commuters.
As at 1 pm, free bus services were being provided at regular intervals between the Tuas Link station and the Jurong East station where the Green line meets the North-South Line or the Red Line.