OAKLAND (CBS SF) – A San Jose woman has been detained to investigate her possible involvement in a triple homicide discovered at the scene of an Oakland house fire early Friday morning, according to authorities.

Police were called to the 9400 block of Dunbar Drive at 12:21 a.m. after someone reported hearing gunshots in the area.

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Authorities arrived on the scene and found an adult male Oakland resident who had been shot lying in the street and performed CPR, but the person died.

A house on Dunbar Drive near where the shooting victim was found was also on fire. Once Oakland fire units responded and were able to put out the fire, two more victims — both female Oakland residents– were found inside suffering from apparent gunshot and stab wounds.

Police and firefighters initially said there was a fire in a garage there that appeared to be related, but have not clarified its connection to the suspect or victims.

Oakland Fire personnel attempted to render aid to the two victims, but they succumbed to their injuries and were pronounced deceased at the scene.

“We are now investigating the homicide of three people,” said Oakland Police Lieutenant Dom Arotzarena.

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Police have detained one person — a female San Jose resident — for questioning in connection with the incident.

“We’re still in the early stages of this investigation,” said Arotzarena.

One neighbor, who didn’t want to show his face on camera, said the two women were a couple and that they had at least three children: two boys and a girl.

Neighbors say it is a normally quiet part of Oakland, out of the way in the middle of an industrial zone and rarely touched by crime. Authorities said there is no danger to the public, but area residents aren’t feeling safe.

“For it to be three people and then for it to be literally right around the corner from your house is just like, not too cool,” said neighbor Erik Matthews.

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Streets in the area have been blocked off since the incident. An FBI forensics team has been brought in to assist with the ongoing investigation.