UPDATE 12:35 p.m. Monday, Jan. 14, 2019 - According to Nicole Johansson of Enloe Medical Center, six patients were discharged on Monday.

Three patients remain in the hospital, but are listed in good condition.

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Updated 7:41 a.m. Monday, Jan. 14, 2019 - Butte County Sheriff's Office says the man who died from an overdose is Aris Turner, 34, of Chico. The autopsy is pending.

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Updated 2:42 p.m. Sunday, Jan. 13, 2019 - Enloe Medical Center reports that two patients were released Sunday after being hospitalized for a mass drug overdose that occurred in N. Chico on Saturday morning. Seven patients remain at the hospital at this time, and all of them are in good condition.

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Updated 2:15 p.m. Sunday, Jan. 13, 2019 - The identification of exactly what caused the symptoms experienced by the man who died and those who were hospitalized due to exposure to an as yet unidentified substance in N. Chico Saturday morning is expected to be released to the public on Monday.

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Updated 11:30 a.m. Sunday, Jan. 13, 2019 - Enloe Medical Center reports an improvement in the conditions of those hospitalized from Saturday morning's drug overdose incident in North Chico. As of Sunday morning, two patients are in serious condition, three are in fair condition and four are in good condition.

Action News Now has made a call to Oroville Hospital to find out the condition of the remaining patient who was taken there for treatment. We will provide this information as soon as we are able. Two Chico Police officers were taken to Oroville Medical Center for treatment for exposure to a Fentanyl-like substance and were later released.

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Updated 10:18 p.m. Saturday, Jan. 12, 2019 - Santana Court at Ceres Avenue is Chico is back open again, after being closed due to Saturday's mass casualty drug overdose incident. The home on Santana Court was deemed a Haz-Mat site by authorities, keeping the area closed to traffic while the cleanup took place.

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Updated 9:50 p.m. Saturday, Jan. 12, 2019 - A spokesperson from Enloe Medical Center has provided an update on the conditions of the people taken to their hospital from the scene of the mass casualty overdose event. As of 9:52 p.m. four people remain in critical condition, two are in serious condition, and three are now in fair condition.

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Updated 9:20 p.m. Saturday, Jan. 12, 2019 - Video from the 6:00 p.m. newscast has been added to this story.

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Updated 5:25 p.m. Saturday, Jan. 12, 2019 - Enloe Medical Center confirms that they still have nine people in their hospital resulting from the mass overdose incident that occurred in Chico on Saturday morning.

Four people are in critical condition. Four others are in serious condition. One person is reported in fair condition and two others have been treated and released.

According to Oroville Hospital three patients were taken there for treatment. Two of them were police officers who have since been released. The condition of the third person taken to Oroville Hospital is not being released at this time.

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Updated 4:45 p.m. from the press conference held by Chico Police Chief Michael O'Brien:

Two of the responding police officers reported feeling the effects of a drug similar to Fentanyl, said Chico Police Chief Mike O'Brien at a press conference Saturday afternoon. They were some of the responders to a mass casualty incident on Santana Court in North Chico. One man died at the scene and 14 others were treated and taken to local hospitals for exposure to Fentanyl or a similar type of drug.

The officers have been treated, released, and have now returned to their homes for rest and further recovery, said Chief O'Brien.

The twelve people who were in the residence and were taken to the hospital were between 19-30 years of age, approximately, said Chief O'Brien. He said they were all adults. Four of them are in critical condition at this time. Chief O'Brien said more fatalities may occur due to this incident.

Four doses of Naloxone were used to help treat victims at the scene, O'Brien said.

He told reporters that someone at the residence, or associated with the residence called 9-1-1 a little after 9:00 a.m. Saturday morning to report the incident.

His detectives are continuing their investigation into what happened in the North Chico neighborhood near Ceres and East Avenue. The home on Santana Court is considered a Haz-Mat site, but neighboring homes are not, authorities said.

Please watch the Facebook LIVE embedded in this article and watch our newscast at 6:00 p.m. with anchor Cecile Juliette and reporters Mario Montalvo and Spencer Joseph for more on this breaking news story.

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Updated 4:00 p.m. Saturday, Jan. 12, 2019 - The Chico Police Chief scheduled a press conference for 4:00 p.m. today about this mass casualty incident.

Updated 2:15 p.m. Saturday, Jan. 12, 2019 - It has just been confirmed that three people were taken to Oroville Hospital, and 11 were taken to Enloe Medical Center.

Enloe has activated their incident command center.

Of the 11 people taken to Enloe, four are in critical condition, three are in serious condition, one is in fair condition, two were treated and released, and the status of one other patient remains "undetermined" at this time.

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Updated 2:00 p.m. Saturday, Jan. 12, 2019 - Action News Reporter Mario Montalvo is still at the scene of the mass casualty incident at 1166 Santana Court in Chico off of Ceres Avenue.

He spoke with neighbors who said they observed late teens, early 20s, coming out of the home this morning. They described them as being disoriented, wearing little to no clothing.

Neighbors said it is normally a quiet street, but noted there were reports to police about the house where the incident occurred.

A group of people arrived and entered the home about 4:00 a.m. this morning said neighbors.

The mother of a man who owns the home told Action News Now reporter Mario Montalvo that her son was asleep when the incident happened.

A press conference will be held by the Chico Police Department at 4:00 p.m. on Saturday. We will keep you updated on the situation, as we have multiple reporters following this story.

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Updated 11:30 a.m. Jan. 12, 2019 - There were six fire apparatus and eight ambulances on the scene at one point Saturday morning, as responders conducted CPR on people who were in the home on Santanat Court. People were still being transported to the hospital more than an hour and a half after the initial incident report was received, Chico Fire Department Division Chief Jesse Alexander said.

Action News Now reporter Hayley Watts said she saw several people who looked like they were between 20 to 30 years old being transported away from the scene by ambulance.

Division Chief Alexander told Action News Now there were 12 people transported to the hospital, but that number has gone up to 14.

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CHICO, Calif. - One person is dead and 14 people were taken to the hospital after a drug overdose incident that occurred in north Chico on Santana Court. A report of a drug overdose at the residence was received by Chico emergency responders at 9:12 a.m. on Saturday, Jan. 12, 2019.

Chico Fire Department Division Chief Jesse Alexander describe it as the largest mass casualty incident he has seen in years. He described seeing six people undergoing CPR at the same time, with six fire units responding to the scene at a home in North Chico.

We have reporters on the scene and will provide more details as soon as they are available.