Did it all start when someone decided to drive away from the pump, with the nozzle still attached to the car?

Yeah - don't do that. Ever. That's the theory though.

KAAL-TV reports the incident occurred, " [...] north of 7th Street at the Baraka Grocery & Mall, which also has gas pumps. Witnesses say someone may have driven away while the pump was still connected to their vehicle, but officials have yet to confirm that."

You could see this happen at around 2:30pm this afternoon on North Broadway.

This incident is still under investigation.