Rescue crews were searching on Thursday for seven people still missing days after an explosion at a fireworks warehouse in Northern California shook a tiny farming community and forced the cancellation of nearby July Fourth celebrations.

Seven people are still "unaccounted for" in Yolo County's town of Esparto after several explosions at a fireworks warehouse resulted in a fire, officials said.

Seven people are missing after a warehouse holding fireworks caught fire and set off a series of massive explosions in Northern California late Tuesday.

California law prohibiting gambling on sporting events, except for betting on horse races, also extends to the increasingly popular daily fantasy sports games, Attorney General Rob Bonta said in a legal opinion on Thursday.

California Attorney General Rob Bonta released a legal opinion stating that daily fantasy contests are illegal in the state "because they involve betting on sporting events."

Rob Bonta's legal opinion classified daily fantasy sports as illegal gambling, claiming that players betting against each other violates state law.