Investigators are reviewing 63 hours of data collected from the black box of a UPS cargo plane involved in a deadly crash that killed at least 13 people in Louisville, Kentucky, earlier this week. Nine people remain missing as authorities sift through the wreckage of Tuesday's crash in an attempt to piece together what went wrong.

After the UPS plane crash that killed at least 13 people, NTSB released drone video footage of the crash site. See the full impact to businesses.

"Looking at this MD-11 UPS crash , this is some of the most terrifying and sad footages I have seen," Ahmed Baokbah told Newsweek.

LOUISVILLE, Ky. (AP) — Videos from phones, cars and security cameras captured the tragic final moments of a UPS cargo plane as it caught fire and crashed in a massive explosion just outside Louisville’s airport, killing at least 12 people and carving a path of destruction on the ground.

The ashes have settled over the charred Louisville neighborhood where nine people remain missing and families cling to hope as investigators comb through the wreckage of Tuesday’s fatal UPS cargo plane crash.

The Marshall Four were honored near the 55th anniversary of one of the most tragic events in U.S. sports history.