Rescue workers work in the rubble at the Champlain Towers South Condo in Surfside, Fla., in this Friday, June 25, 2021, file photo.

MIAMI — Video released by a team of federal investigators shows more evidence of extensive corrosion and overcrowded concrete reinforcement in a Miami-area condominium that collapsed in June, killing 98 people.

The National Institute of Standards and Technology also announced Wednesday it will conduct a five-pronged investigation into the Champlain Towers South collapse, which will be led by Judith Mitrani-Reiser. She is a Cuban-born engineer who grew up in Miami.

“We are going into this with an open mind and will examine all hypotheses that might explain what caused this collapse,” Mitrani-Reiser said.