The cause could be millions of migrant labourers returning home to their villages.

And the committee will say low-skilled workers in particular have suffered from competition with migrant labourers willing to take less pay.

Millions of migrant labourers in the region endure gruelling conditions and few rights, bonded to their employers or to shady intermediary sponsors.

Contractors often opt for shoddy materials to cut costs, officials turn a blind eye in return for kickbacks and cheap migrant labourers are given little or no safety training.

The surrounding areas are inhabited by slum dwellers, truckers and migrant labourers.