Three crane workers died on Sunday when a Wolf Luffing crane they were extending collapsed in Docklands, falling more than 100m.
The men, two from West Yorkshire and one from Southwark, were operating the crane's self-climbing mechanism when the accident happened. They had already completed a similar operation on another crane on the site. The cab, jib and counterweight all fell an estimated 135m.
The site's prime contractors were Canary Wharf Contractors but the crane was being operated by Hewden Tower Cranes of Castleford, West Yorkshire. The Health and Safety Executive was not clear who employed the men who died.
The area in Canada Square is to be home to a new super-tall HSBC bank headquarters. HSBC, Canary Wharf Contractors and Hewden Tower Cranes were all unavailable for contact.