Gas-rich Qatar's record on migrant labour has been under the spotlight since it won the right to host the 2022 World Cup .
Ninety per cent of Qatar's 2.75 million people are expats. Many are from developing countries and working on projects linked to the tournament - stadium construction has continued even as other businesses have shuttered.
Rights groups have previously criticised labour practices in Qatar, which has responded with initiatives to enhance worker welfare. But the lockdown of the densely populated Industrial Area has drawn scrutiny.