KUALA LUMPUR, Dec 24 — Two workers remain trapped under the rubble in the latest collapse to hit LRT extension project, according to rescuers, after it was earlier feared as many as four were caught in the incident near Putra Heights in Subang.

Selangor Fire and Rescue Department assistant director of operation Harul said a K-9 unit is currently aiding rescuers in locating the two workers.

“When we reached earlier, there were about eight people were working where the concrete had fallen,” he told reporters outside the construction site.

He added that four escaped with light injuries while two others were unhurt. All six, believed to be migrant workers from Bangladesh, have been sent to hospitals for treatment.

“Now we believe still two more victims are still trapped under the rubble and we have moved the STORM unit from Shah Alam and the Subang Jaya and Puhong Fire and Rescue Department to assist with rescue works,” he said.

STORM is the department’s Special Tactical Operation Rescue unit.

Mohd Sani added, however, that the victims’ conditions were currently unknown.

According to the Fire and Rescue Department earlier, the mishap occurred at 4.29pm today during a concrete pour for the train depot at Kuala Sungai Baru.

The department earlier said that three victims were trapped in the collapse, but Prasarana Bhd, the operator of the LRT line, later issued a statement saying that four people were thought to be stuck under the rubble.

Prasarana also said the accident took place when the formwork and scaffolding collapsed during the concreting of the deck slab for the train depot.

Today’s collapse is the latest to hit the LRT Line Extension Project (LEP) that has an eventful history, with several cases of falling structures including one fatal incident.

Last March last year, a man was killed when a 10-tonne piece of construction equipment fell from a crane used for the LRT extension and crushed his car along Jalan Lapangan Terbang Subang.

In June this year, two people were hurt when a metal beam fell from a crane and onto their vehicle.

Construction of the Putra Heights terminal began in 2011 as a part of the LEP, which involves additions to the existing Ampang and Kelana Jaya LRT network.

The Sri Petaling and Kelana Jaya stations are expected to be extended to Putra Heights, which will be featured as “an integrated station” where the two lines meet.

According Prasarana, the extension to the Ampang line - which passes through  residential and commercial areas in Bukit Jalil, Bandar Kinrara, Puchong, Kampung Sri Aman and

Putra Heights - will be extended for 18.1 kilometres.

Meanwhile, the Kelana Jaya line will stretch to cover another 17.4km passing through Lembah Subang, Subang Jaya, USJ and Putra Heights.