An explosion that tore apart a Toyota sedan in Daly City, California, on Wednesday appears to have been accidental and an isolated incident, according to authorities. The blast, which occurred around 10:15 a.m. near Skyline Drive and Westline Drive, sent shockwaves through the neighborhood and could be heard miles away. Investigators from the Daly City Fire Department, the FBI, and the ATF examined the wreckage, which included a propane tank, leading them to believe it was the likely cause of the explosion. No one was in the car at the time of the blast, and no other damage was reported.