The police are investigating the incident that occurred at about 10am at the Church of Our Lady of Perpetual Succour in Siglap, just prior to a service.

The 37-year-old church volunteer, a billing operations manager who did not want to be named, told The Straits Times: 'A lot of people were in shock when they saw it happen.'

Read Teh Joo Lin's full story in Wednesday's edition of The Straits Times.