The fire that engulfed a vacant apartment in Escondido early Monday is considered suspicious, officials told NBC 7.
The fire was reported around 5:15 a.m. in a detached four-bedroom apartment on 1121 North Escondido Boulevard.
Firefighters said the unit was fully-involved when crews arrived.
Fire officials said the apartment is available for rent and was left with the doors unlocked.
The landlord showed the apartment to a prospective tenant Sunday.
No further information was immediately available.