Firefighters said a young man smoking marijuana in his parents' garage sparked a fire in Rancho Penasquitos.

That man and a firefighter were injured in the blaze.

The fire started just after 6:30 p.m. Thursday in the 8800 block of Adobe Bluffs Drive.

There was brief concern that the flames could jump to a neighboring house.

Witnesses said the fire sparked two explosions and intensified in a matter of minutes.

No arrest was made in the incident.