Firefighters knock down 2 fires at commercial buildings in San Bernardino

Firefighters knocked down two fires in San Bernardino overnight. 

The first fire broke out in a commercial building on Fourth Street west of Arrowhead Avenue. Several units on the second floor were engulfed. After extinguishing that one, fire officials say a second fire erupted in an adjacent building in an elevator shaft. 

There were no reports of injuries. It remains unclear if those fires are related.