[Update on 5 September from AVA:

AVA’s priority in managing the wild animal population is to ensure public health and safety is not compromised. AVA will assess all feedback and determine the necessary actions. For animals that do not pose significant public health or safety concerns, we will advise feedback providers on ways to mitigate the issues. This may include plugging up access points for wildlife or removing sources of food within properties.

For animals that pose significant public health or safety concerns, such as when animals enter premises and destroy property, injure residents or are potential carriers of disease, AVA will work with the relevant stakeholders to explore removal or relocation options where possible.

Monkeys may carry zoonotic diseases that are harmful to public health. Aggressive monkeys are also a risk to public safety. Since 1 September 2017, AVA has received a few pieces of feedback from the public on monkey-related issues at Punggol Waterway. We have been working with the Pasir Ris - Punggol Town Council to monitor and conduct surveillance of the area. ] 

Looks like Segar residents in Bukit Panjang are not the only ones troubled with monkey woes.

Just a few months after various agencies grappled with the lone wild macaque at Segar area, here's another one — this time, in Punggol.

Some residents at Punggol Waterway Sunbeam, an HDB estate, had a troubling long weekend with a not-so-friendly visitor to the neighbourhood as one Joseph Tan, shared his experience on Sep. 2:

Tan recounted his "super close encounter" with a lone long-tailed macaque which snatched bottles, food and drinks from passers-by, also allegedly showing aggression to children:

"Yesterday, I started off with shock and surprise to have monkey at my estate. I was joking around got funny "Monkey business" happening.

Not till only when I witness how this monkey snatch people bottle, food, drinks and near attack to some children (without the kids or adults provoking or playing with the monkey), and how this monkey can climb so fast upwards almost enter resident's house.

Today, same timing around 5pm, it returns again. This time, climb higher, move faster and even scratch a child's leg. I even ensure the boy's safety and make sure accompany him to lift and ask him go home."

Not a stranger to the estate

This fellow appears to already be human-acclimatised and no longer afraid of people, evidenced by its brazen strolls along balconies, climbing to high levels of the blocks and sitting on opened windows:

It appeared to recognise items such as water bottles and plastic bags and cups as sources of food too:

Residents' Committee members, said Tan, have already been informing residents to close their windows and stay away from the macaque. 

He also said AVA officers went down to the area but the macaque successfully eluded them. 

Monkey woes in other residential areas nearby

Some commenters said it's possible the same macaque was terrorising residents at The Terrace, an executive condominium also located at Punggol Waterway:

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Why is this macaque so bold?