IWK said its operations team inspected the site after receiving a report from Kuala Lumpur City Hall (DBKL) and found that the sewage flow in the pipes was normal.

“Further inspection using CCTV yesterday afternoon revealed that the public sewage pipes and channels were in good condition, with no signs of damage,” it said in a statement today.

It said it believes the sinkhole was caused by other factors and requires an investigation by other relevant agencies.

“The CCTV investigation results have been reported to DBKL,” IWK said.

The drain, which collapsed on Monday and has since been cordoned off by DBKL, is the second of three sinkholes that have appeared in Kuala Lumpur over the past week.

In the first incident on Jalan Masjid India last Friday, a 48-year-old visitor from India, Vijayaletchumy, fell into an 8m-deep sinkhole.

Another sinkhole appeared in front of Masjid India on Wednesday, likely due to heavy rain, but no casualties were reported.

Federal territories minister Dr Zaliha Mustafa said approvals for all new development projects in the capital city are on hold.

However, she said Kuala Lumpur is still safe, but advised caution around areas affected by sinkholes.