Residents of a Florida apartment building that collapsed last week received a letter in April warning of worsening structural damage.
The letter, obtained and reported by US media, was sent by the president of the apartment block's building association.
At least 12 people were killed and 149 more are still missing in the collapse.
The letter is the latest in a string of documents that have emerged providing evidence that the Champlain Towers South building in Surfside, north of Miami, had known structural issues.
Lawsuits are already being filed over the deadly disaster, with the latest accusing the building association of "reckless and negligent conduct".