Transcript for Daring rescue after massive explosion in Baltimore
Liberty. Liberty. Liberty. Liberty. Next tonight, the high rise explosion in Baltimore that caused a partial roof collapse and left workers sd on scaffolding ten stories up. Several injuries have now been reported. ABC's Trevor Ault has the latest. Reporter: Tonight, stunning images and a daring rescue after a massive explosios downtown Baltimore. Two male hanging off scaffolding. Reporter: Two men whoed been cleaning windows helplessly dangling on scaffolding this morning ten stories up the side of the Baltimore electric gas company his rise. The force of the blast knocking a second scaffold off the building. Baltimore's elite special operations team performing a highly technical rescue. One of our members had to step out on the scaffold, climb up the scaffold, climb through the window of the 11th floor and bring himgh the 11th floor. Reporter: With part of the roof collapsing, firefighters clearing the high-rise floor by floor, and evacuating two neighboring buildings. In total, 21 people taken to the hospital. Nine of them now in critical the cause of the explosion is under investigation, but the company says construction to the air and boiler system is likely to blame. Thankfully, because of the pandemic and the holiday, this building was mostly empty, otherwise this could have been a lot worse. Linsey? Trevor, thank you so much.
This transcript has been automatically generated and may not be 100% accurate.