( CNN ) -- Police and fire officials in San Jose , California , are asking for the public 's help to find the person responsible for setting roughly a dozen fires in the downtown area . Multiple fires were lit over several nights last week between 2 a.m. and 6 a.m. , according to San Jose police , which released a statement and sketch of the suspect . No one was reported injured . `` These fires were very serious in nature and had the potential to cause serious injury or loss of life to both residents and firefighters , '' the statement read . Of the 10 fires set last week , five had residents inside when the blazes began , said Fire Capt . Christopher Murphy . Most were started on the outsides of the structures , which were downtown or south of downtown . Some structures were destroyed while others suffered minor to moderate damage . Eight of the 10 fires were set intentionally , while two remain under investigation , Murphy said . Firefighters responded Sunday to three more suspicious fires , which may have been set by the same suspected arsonist , CNN affiliate KGO reported . `` We want to make sure people clear out anything that 's flammable from their front yards , and we want to make sure everybody sees the sketch of the suspect , '' said San Jose Councilmember Sam Liccardo , according to KGO . `` And we want to make sure that everyone who needs a fire alarm or batteries can get a fire alarm or batteries . We can supply it . '' A $ 10,000 reward is being offered for information leading to the arrest and conviction of the person or people responsible for the fires . In December : 550-acre fire in California 's Big Sur even burns fire chief 's home . CNN 's Janet DiGiacomo contributed to this report .
About a dozen fires have been set in the downtown area of San Francisco . Police have a sketch of the suspect . No one has been reported injured in the fire .