Human remains have been uncovered amid the debris of a firework warehouse, days after it caught fire and exploded, setting off a wild pyrotechnics display over California.

In the first moments after explosions at a fireworks warehouse in Esparto rocked the community, a man who lived nearby sprang into action towards falling flames and live fireworks, just hoping he could help.

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