The suspect was taken into custody just before noon.
Firefighters responded to the home on Vine Street Street near Cornwall Avenue around 6:30 a.m. after receiving a call about a burn victim.
Once on scene, firefighters realized that the suspect's 73-year-old mother had been set on fire, allegedly by the suspect himself.
A SWAT team responded to the scene as authorities tried to get the suspect to come out.
The San Bernardino County Sheriff's Department said the victim was taken to a hospital in critical condition.
Nearby homes were evacuated out of an abundance of caution.
This story will be updated as more information becomes available.