The death toll from last week’s collapse of a garment building in Bangladesh has surpassed 500. Bodies are still being found in the rubble as relatives search for their loved ones. One of the major Western companies tied to the disaster is vowing to remain in the country, but with higher standards for its workers. The Canadian retail giant Loblaws used the building for manufacturing its “Joe Fresh” clothing line. On Thursday, Loblaws CEO Galen Weston said he is “shaken” by the incident and vowed to unveil new safeguards.

Galen Weston: “I’m shaken by the events that took place in Bangladesh last week. And my thoughts and prayers go out to all those who were injured and to all the families who have lost loved ones. This was a senseless tragedy. It should not have happened. Based on what we know, the top floors of the building should never have been built, and reports from the ground suggest that garment workers should never have been allowed back in the building after an evacuation was ordered.”

The owner of the building, Sohel Rana, was arrested in the days after the disaster along with several factory owners. On Thursday, an engineer who had warned the site was unsafe, Abdur Razzaque Khan, was also detained. Police say Rana and the other owners are blaming Khan for the collapse, even though he is known to have urged them to close the building because of cracks in its structure. The Dhaka collapse is considered the worst industrial accident in the garment industry’s history. It has sparked a series of protests in Bangladesh, culminating in a demonstration of tens of thousands on Wednesday, May Day. At the Vatican this week, the new pontiff, Pope Francis, decried what he called “slave labor” at Bangladeshi factories used by Western firms.