Federal territories minister Dr Zaliha Mustafa said investigations by a special task force led by Kuala Lumpur City Hall (DBKL) found the incident was not caused by the presence of a limestone layer beneath the ground, as initially feared by the public.

“The site of the incident lies on the Kenny Hills Formation and is underlain by schist rock, while the limestone layer is only found at depths of between 60 and 70 metres.

“Therefore, the incident cannot be directly attributed to limestone.

“The task force concluded that the failure of the sewer pipe structure, which had corroded due to chemical reactions and soil instability, was among the main factors that led to the formation of a cavity beneath the pedestrian walkway, ultimately causing the sinkhole,” she said when replying to a question from Yusuf Abd Wahab (GPS-Tanjong Manis) in the Dewan Rakyat today.

Indian tourist G Vijaya Lakshmi, 48, went missing after falling into an eight-metre-deep sinkhole that opened up at her feet on the morning of Aug 23 last year.

Zaliha said the full investigation report had been presented to the Cabinet on Aug 20, while a special public report will be released by DBKL by the end of this year.

She said DBKL is currently conducting geotechnical studies on major roads within Kuala Lumpur’s Golden Triangle area to determine soil profiles and stability.

They are using methods such as borehole resistivity, ground penetrating radar, Light Detection and Ranging, and Interferometric Synthetic Aperture Radar.

“Preliminary findings indicate that no areas are high-risk for sinkhole occurrence.

“This study is important to ensure the safety of infrastructure within the city centre and the zone hosting the Asean Summit 2025,” she said.

She added that the government has now established a more capable emergency response team to ensure swift and effective action should a similar incident occur in the future.