Selangor fire and rescue department chief, Norazam Khamis said the victims, in their 20s and 40s, were carrying out construction work under the 12-metre high concrete structure, near the Kota Damansara exit toll, when the incident occurred at 7pm.

“A construction worker was slightly hurt while another was seriously injured on the waist after being hit by a chunk of rubble. They were sent to the Sungai Buloh Hospital for treatment,” he said.

The highway developer, Projek Lintasan Damansara-Shah Alam Sdn Bhd, said the incident took place at a closed location on the Damansara-Shah Alam Elevated Expressway (DASH) construction site and did not involve road users.

“The response team from DASH were at the scene of the incident to control the traffic and move the metal reinforcements,” it said. A stop-work order at the construction site had been issued immediately.

The company said the developer and main contractor involved would give their full cooperation in the investigation conducted by the authorities.