The authorities have stepped in to manage the crow population in Toa Payoh this week after attacks on residents.

The Agri-Food and Veterinary Authority (AVA) told The Straits Times yesterday that it had received two reports of crow attacks near Block 205, Toa Payoh North, since Monday.

"To ensure public safety, AVA took prompt follow-up action to manage the crow population by removing crows and crow nests," the authority said.

A 55-year-old hairdresser, who gave her name as Xu Jinli, told Chinese-language newspaper Shin Min Daily News yesterday that crows are often seen in the area.

But groups of them have recently become aggressive and repeatedly harassed residents, she said.

Ms Xu said at least 30 people were attacked by crows within two hours yesterday afternoon.

Several were bitten on their heads.

While there is a sign in the estate warning residents against feeding the crows, Ms Xu said that she has seen some people feeding the birds bread and other food items.

The AVA said crows are particularly protective of their young and may attack when fledglings are in the nest or when they sense that fledglings are being threatened.

The authority advised the public to "avoid picking up crow fledglings that may have fallen from the nests, as they might be mistaken for predators".

In addition, the public should ensure proper disposal of food waste and not feed the birds.

"Easily available food sources will encourage birds to congregate and result in an increase in their numbers," the AVA said.

Crow-related issues can be reported to the AVA on 1800-476-1600.