Police are also investigating a separate pair of overdoses reported at 5:15 a.m. Saturday at another Santa Rosa residence, where two girls, ages 14 and 16, were hospitalized.

Santa Rosa authorities announced that at least two teens have died and two others were hospitalized following possible fentanyl overdoses over the weekend, with police making an arrest.

Santa Rosa police investigators said on Monday they're conducting multiple investigations into the overdose death of two high school students, and the poisoning and hospitalization of two others, all due to fentanyl.