Factory bosses Mahbubur Rahman Tapas and Balzul Samad Adnan surrendered to police on Saturday while Aminul Islam was arrested later the same day.
Police said they had ordered an evacuation of the building on Tuesday after cracks appeared, but that the factories ignored them and were operating the next day.
VIDEO – Survivor speaks of collapse whilst authorities fire on angry protestors:
On Sunday, thousands of relatives of missing workers were waiting at the site as survivors and the dead are pulled from the rubble.
Police said 353 bodies had been been found, 301 of which had been identified. A further 2,431 people are known to have survived.
VIDEO - Western brands criticised over factory collapse:
BBC News: Shoppers in
London were asked if they knew where the clothes they were wearing were manufactured and if they were aware of the Dhaka building collapse in Bangladesh.
Oxford Street, London, spoke about what they knew of events in Bangladesh and whether they would be happy to pay higher prices for their clothes.
Watch the interviews here: http://www.bbc.co.uk/news/world-asia-22303266
garment industry scrutinized:
Why are workers who make cheap clothes paying with their lives?
Sources: BBC News, ITN, Al Jazeera, CNN, Daily Mail, The Independent