Workers gathered this morning at the site where a crane collapsed on to a block of flats and killed two people.
The crane driver was one of the two men who died at the block in Battersea, south west London, and the other victim is thought to have been washing his car.
Workers from construction company Barrett arrived at the site this morning and stood in a small group across the road.
The site remained closed behind a police cordon. A bouquet of flowers was attached to the fence overnight.
Police and company bosses also arrived at the site this morning, and the Health and Safety Executive announced last night that it had begun an inquiry into how the crane collapsed.
Part of the crane appeared to be detached and remained hanging off the residential flats next to the site.
The two-storey building was evacuated following the incident. Police said no one inside was injured.
Barrett said in a statement it was co-operating with the investigation authorities.
The company said last night: "Our own health and safety team and a senior management team are present on site. We will also be carrying out our own investigation."