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In what could be a first, two men who look like they are in their late-20s or early-30s went to ask for donations for charity from the residents of a Hougang Street 51 HDB flat at 1:21am -- and claiming to be "student volunteers".

The bizarre request and antics of the duo were caught on a closed-circuit television camera.

What video showed

Smoking at first

In a video submitted to Mothership.sg, the resident whose unit was approached said the two men were seen smoking outside his unit.

The incident took place on June 25.

They appeared at around 1:15am.

They were chit chatting with each other and appeared to be talking about and pointing at the unit they were standing beside.

Checked out surveillance device

At one point, one of the men even walked towards the area where the camera was filming, as if to check if there was a surveillance device.

Left briefly

The men then went down the stairs.

Waited for response

They reappeared at the unit and were seen waiting for the occupant of the flat to open the door.

When a woman opened the door, one of the men in glasses said in Mandarin: "Hello, sorry about this, but we are student volunteers."

After confirming that the occupant could converse in Mandarin, the man continued: "We are here to collect an one-off donation."

When the woman turned them down, the man said it was okay and left.

Pulled faces

Before they did, both of them pulled faces.

They then walked away.

Police report lodged

According to Stomp, the resident lodged a police report.

The person who shared the video said the footage should be publicised to allow others to be alert about such requests and not fall victim to scammers.

The resident added: "This is the first time I've seen these two men around my neighbourhood and the very first time having 'charity' groups visiting past midnight."