The Singapore Police Force announced that they have arrested a 69-year-old man in relation to the "suspicious substance" incident.

This comes 5 hours after Woodleigh MRT station was shut down temporarily at 1pm after an unidentified substance was found in the station. It turned out to be baking flour.

Here's the police's full statement:

The Police have arrested a 69-year-old man for an offence of Public Nuisance under the Penal Code after he left suspicious white substance at Woodleigh MRT station, triggering a temporary closure of the MRT station for about 3 hours.

On 18 April 2017 at about 1.00pm, the Police were alerted to a case of suspicious white substance found at Woodleigh MRT station. Singapore Civil Defence Force’s (SCDF) HazMat officers subsequently established the substance to be baking flour. Police investigations are ongoing.

The Police treat all security threats seriously and will not hesitate to take action against anyone who cause public alarm.

The Police would also like to remind the public to report any suspicious items or behaviour to the transport authorities or the Police immediately.

This is the second time in a month that an MRT station was shut down due to security concerns.

Previously on Apr. 2, Hougang MRT station was temporarily closed after a suspicious bag was found at the station.

The owner of the bag, a 39-year-old man, was arrested on the same day. Initial reports said that he left the bag in the station while he ran errands. The bag contained household items.

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