For many people in Nevada and northern California, Sunday morning was disrupted by a sonic boom and a fireball streaking across the sky.
According to the Associated Press, the unannounced pyrotechnics prompted a flood of 911 calls in both states.
"It knocked me off my feet and was shaking the house," said a mother in Arnold, Calif., who said she heard a booming sound at about 8 a.m. "It sounded like it was next door."
Those who happened to be looking at the sky say they saw a blazing light hurtling across the sky.
"It is an event that makes you glad to be alive," Matthew Neal of San Francisco told the AP. "The main body was bright green and the head was bright red and white."