SINGAPORE- The authorities have investigated the case of a doll placed on the ledge of the MRT tracks at Dhoby Ghaut station, and found no evidence of a security breach, Transport Minister Khaw Boon Wan told Parliament on Thursday (March 2).

The Land Transport Authority and the police came to this conclusion after reviewing closed-circuit television footage and physically checking on the possible track access points, he said.

A commuter on board the North-South Line train towards Jurong East had spotted the doll on the tracks at Dhoby Ghaut station in late January. She posted a photo of the doll on her Twitter account, and her tweet was shared more than 8,000 times, with netizens speculating how the doll ended up there.

Train operator SMRT removed the doll the next day, and started investigations into the matter.

Mr Khaw was responding to Non-constituency MP Leon Perera, who had asked about the outcome of the investigation.

Offering a suggestion for how the doll got there, Mr Khaw said: "One possible explanation is that the doll was accidentally dropped by a commuter through the platform gap, and then picked up and placed on the tunnel wall by a worker."

He added that objects being dropped through the platform gaps "are not common, but not uncommon either", though there have been no identical cases of doll sightings.