Three construction employees arrested as firefighters battle to reach trapped people, with many still missing

• How the fire unfolded – visual guide

Hong Kong police have alleged unsafe scaffolding and foam materials used during maintenance work may have been behind the rapid spread of a devastating fire at a group of residential tower blocks that has killed at least 94 people and left scores missing.

Firefighters were still battling to reach people who could be trapped on the upper floors of the Wang Fuk Court housing complex on Thursday due to the intense heat and thick smoke generated by the fire. Late in the day, a survivor was rescued from a stairway on the 16th floor of one of the towers, the South China Morning Post reported.