Bangladeshi police have arrested an engineer they say was consulted on the construction of the collapsed factory just outside Dhaka.
The death toll from the collapse has risen to 487.
A young woman has been freed from the wreckage of a building in the Bangladeshi capital 17 days after its collapse killed hundreds.
The Bangladesh High Commissioner has told me he believes that Western companies share some of the blame for conditions in Dhaka's factories.
Primark, who bought products from the factories in the destroyed Rana Plaza in Dhaka, will pay compensation to the families of the victims.