The explosion at Caleb Farley's home that took the life of the NFL player's father was so mortifying ... multiple people phoned cops in a panic, saying it "sounded like a bomb" had gone off in the neighborhood.
TMZ Sports has obtained several 911 calls from the night Farley's residence in Mooresville, N.C. blew up without a moment's warning ... and you can hear in the audio, people were terrified.
One caller told dispatch that the explosion was so loud, it woke them up ... and rattled their doors and windows.