The National Institute of Standards and Technology has added a remote sensing and visualization project to its roster of queries into the June 24 partial collapse of the Champlain Towers South residential condominium in Surfside, Florida, which killed 98 people.

Settlement and roof tilt changes during installation of casings for new piles is being closely monitored.

Aging buildings are undergoing heightened scrutiny as officials consider increased regulations, inspections.

The implosion consultant observed notable differences between the structure as built and one set of 1979 building plans provided by Surfside, Florida, officials.

Rescuers continue victim search with no survivors found since early June 24 and new estimate of 159 people unaccounted for, as investigators seek a cause for the partial collapse of the 12-story beachfront building in Surfside, Fla., north of Miami Beach. White House declares emergency at the site with FEMA to coordinate federal aid.