Cleanup continued on Monday from the bridge collapse that caught the nation's eyes last week in Pittsburgh.

As part of an effort to square away the remaining debris, a Pittsburgh Port Authority bus was lifted from the wreckage by a crane.

That bus had been among the vehicles traveling over the bridge when it caved in. Several passengers were on board at the time. It was reported that 10 total people involved in the incident were injured while four of them were sent to the hospital to receive treatment.

The bridge was built in 1970, and ran over a section of Frick Park before it collapsed into a ravine on Friday. 

Frick Park is one of the largest and most visited recreational areas in the city. 

Pittsburgh officials say most of the park has reopened, but some sections will remain closed while the area is cleared.

The entire park was closed this weekend when the National Transportation Safety Board arrived to conduct a federal investigation on Saturday. The board's examination is looking to determine what factors and conditions caused the bridge to collapse. 

After President Joe Biden spoke at the fallen bridge last week, the White House estimated 43,000 bridges across the United States are in poor condition. It is believed that about 3,300 of those bridges are in Pennsylvania alone.