The grim task of finding victims from the firestorm that followed the crash of a UPS cargo plane in Louisville, Kentucky, has entered a third day.

The black box from the crashed UPS cargo plane was found intact as officials continue to look for information to find the exact cause of crash.

UPS said on Wednesday it would reopen its sprawling air cargo hub in Louisville, Kentucky, after temporarily shuttering it a day earlier due to a deadly plane crash, a move that will begin easing delays in the delivery firm's global network.

A UPS cargo plane burst into flames and crashed shortly after takeoff in Louisville, Kentucky, killing at least 12 people, including a child, authorities said.

The death toll climbed to at least 12 on Wednesday, Nov. 5, and several people remained unaccounted for, said Louisville Mayor Craig Greenberg.

Two businesses were directly affected by the UPS plane crash Nov. 4: Kentucky Petroleum Recycling and Grade A Auto Parts.