Tips for commuters
The two major public transport operators, SMRT and SBS Transit, say they are working closely with the police on the situation.
They advise commuters to:
Immediately alert other passengers or staff on board the bus or train.
Bus captains will call the operations control centre, which will alert the police.
Press the emergency button, which is able to track the location of the train and staff will be at the next station to help.