HDB blocks near Block 248 Choa Chu Kang Avenue 2 in the evening, ordinary window lights against a darkening sky
Block 248 Choa Chu Kang Avenue 2 — the estate as I remember it that night, lit and familiar from a distance I could not cross.

My aunt had already cleared the plates when I said I would walk down to the car park instead of waiting for the lift with everyone else.

I live in Punggol — blocks, waterway, the usual evening bus home — but that Monday I was across the island at my relative's flat near Choa Chu Kang, full from dinner and slightly drowsy in the way a long family meal makes you. The corridor outside smelled of detergent and fried shallots. Shoes lined up by the door. Through the lift landing window I could see the usual geometry of the estate: rectangular towers, laundry poles, a strip of grass between blocks that children treat as a runway until someone calls them in.

I took the stairs because the lift was held on a lower floor. Two flights down, then the void deck, then the path toward the avenue. Block 248 Choa Chu Kang Avenue 2 sits in the part of the estate I know only from these visits — familiar enough that I could find the car park without checking my phone, unfamiliar enough that I would not recognise a neighbour if they nodded at me.

That is where I was — between the void deck pillars, keys in my pocket, thinking about the drive back to Punggol — when the sound reached me.

Not one siren. Several, layered, moving in a way that did not sound like a single ambulance on a fixed route. The noise rolled along the avenue and bounced off the HDB faces, arriving in uneven pieces, as if the buildings were passing it hand to hand before it got to my ears. I stopped walking. A man ahead of me stopped too, halfway to his car, head turned toward the sound without knowing where to look.

Here is the honest limit of my view. No flash of lights from where I stood. No barrier tape. No cluster of people on the pavement. I stayed under the void deck and did not move toward Block 248. I cannot tell you what occurred at ground level because I was not at ground level near it. What I had was audio and stillness — corridor lamps burning steadily, a kitchen screen glowing two floors up, the familiar clunk of a lift shaft doing its job in the next tower.

The feeling was harder to catalogue than the facts. Dinner had already tipped toward goodbye; I was in that soft descent you get when a family visit ends and the drive home waits. Then the sirens cut across the estate and everything within hearing distance seemed to stall — not mute, but held, neighbours slowing on the path, the man by his car with his hand on the door handle, all of us listening for a cue that never arrived in words.

It was about 8.55pm — or so I worked out afterward from my phone log. I do not trust the minute hand on memory. What stayed with me was the texture of the minutes after — urgency draining away and leaving a hollow where information should have been. Something grave had happened within a few blocks; I felt that clearly. News I read afterward mentioned an incident in the neighbourhood. I will not describe what I did not observe myself. I was elsewhere. I heard vehicles hurrying. I repeat, because it matters: I do not know what took place.

I stood under the void deck longer than I needed to. My aunt messaged asking if I had reached the car. I replied yes before I had moved, then walked the rest of the way with the sound fading behind me. The car park was empty except for my vehicle and one motorcycle. I sat inside for a moment before starting the engine, listening to the estate return to its smaller noises: a trolley bin, a parent shouting a name toward the playground, tyres on the avenue.

I drove back to Punggol along familiar roads. The waterway was dark. My block greeted me the way it always does when I pull into the lot — lit, rectangular, home. Ordinary arrival, except part of me was still standing under another estate's pillars trying to reconcile the calm surface with the alarm I had heard through it. That mismatch is the reason for this page — not to inform anyone, only to record how the night refused to land cleanly in my head.

I have visited my aunt again since. From the footpath to the car park, Block 248 Choa Chu Kang Avenue 2 looks as it did before — same grass verge, same fruit seller some mornings near the bus stop, same laundry shifting on poles. Reports exist; I have read headlines. Headlines are not witness. I will not invent a scene from sirens alone. What I carry is thinner than that: overlapping alarms, a collective pause, an estate that appeared untouched while sounding like it was not.

Others may have stood nearer and seen more. I will not speak for them. My account ends at the void deck rail with incomplete ears and no tidy ending — just the date in my notebook and the block continuing its nights without asking my permission.