Miami apartment block which collapsed showed extensive corrosion

The Champlain Towers South collapsed overnight killing 98 people AP Photo/Gerald Herbert, File)

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 on Wednesday that 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.