Massive search and rescue effort underway after Iowa apartment building collapse.

A portion of a six-story apartment building in Davenport, Iowa, collapsed on Sunday, leading to the rescue of eight people and injuries to an unknown number of others. The cause of the collapse is still under investigation, and authorities are searching for missing residents. The building's ownership had "permit issues" for exterior brick work, and the owners were under city orders to make specific repairs and upgrades. The building is still structurally unsound, and the current rescue mission will soon become a recovery operation.