A San Francisco home was searched Tuesday in connection with the deadly Northern California fireworks explosion that killed seven people on July 1. Cal Fire's state fire marshal was leading the investigation at the Inner Richmond home on 2nd Avenue,

The cause of the fire, which burned 78 acres, remained under investigation, according to Cal Fire, the state firefighting agency.

Human remains have been found at the warehouse filled with fireworks that exploded in Northern California this week, officials said.