A woman in Yishun reported seeing a stranger peering through a gap in a corridor wall at 1am. She was sitting at a void deck when she noticed the figure, which disappeared before she and her friends could approach. The incident has raised concerns about safety in residential areas. Authorities have been informed and are investigating the matter. The woman described feeling unsettled by the encounter, emphasizing the unusual nature of the sighting. No further details about the individual or the circumstances have been released. The case highlights ongoing worries about security in public housing. Local residents are urging increased vigilance and patrols in the area.