An Indiana high school was evacuated Tuesday after more than 20 students and staff members were injured following reports of a chemical spill, though no evidence of a spill was found.

Officials at Beech Grove High School in Beech Grove, Indiana, pounced into action after a staff member notified the school resource officer there was white smoke coming from a girls' bathroom.

Superintendent Laura Hammack said in a statement Tuesday that school principal, Andrew Karr, initiated a fire drill to evacuate the building as quickly as possible, and within three minutes, all students and staff had exited the high school.

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As the Hornet Avenue school was being evacuated, emergency crews were dispatched to the scene.

"We are deeply grateful for the comprehensive emergency support provided by these incredible professionals," Hammack said.

Hammack said 21 individuals – nine students and 11 staff members – expressed health concerns related to smoke inhalation, and a physician on-site conducted medical reviews of each person.

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The superintendent said none of the individuals were recommended to be transported to an area hospital.

All students were sent to the Beech Grove Community Center and Hornet Park Elementary school to either be picked up by their parents, or board a bus home.

The district reported that every student was picked up within 40 minutes of the start of the evacuation.

According to the district, the Indianapolis Fire Department Hazmat Unit investigated the scene and could not find evidence of a chemical spill, adding that the surfaces were tested, and they could not find residue of a chemical spill.

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District officials said they will be reviewing all security cameras and investigating the incident to understand what occurred in the bathroom. 

"A disruption of the school day like what was experienced today is unacceptable, and we will work tirelessly to ensure that the cause of the incident is uncovered, and appropriate consequences are rendered," Hammack said.

As a result of the incident, the district canceled all after-school events, allowing custodians to clean and sanitize the building in time for school Wednesday.

"I am extremely proud of the incredible response by our law enforcement, fire department, and first responders during this very active event," Hammack said. "Additionally, the BGHS students, teachers, and staff as well as our colleagues at Hornet Park and the Beech Grove Community Center were nothing but extraordinary. 

"Thankfully, a potentially frightening event ended with a positive and safe outcome."

An attorney for a Colorado woman accused of stabbing her 11-year-old stepson 18 times before shooting him in the head and eventually dumping his body in Florida while claiming the boy had gone missing cited a "major psychotic crack" Monday in justifying why she changed her plea to not guilty by reason of insanity. 

Letecia Stauch is accused of killing 11-year-old Gannon Stauch in his bedroom a few hours before reporting him missing Jan. 27, 2020, while his father was on a National Guard deployment. Her arrest affidavit cites internet searches suggesting she was unhappy in her marriage and resentful of being treated like an unpaid babysitter.

At the start of her trial Monday, a prosecutor told jurors Letecia Stauch knew "she could determine right from wrong."

"Gannon suffered 18 stab wounds to his body, his chest, his back, his head, and most importantly, his arms and his hands. Why is that important? He was fighting for his life. And those were defensive wounds," District Attorney Michael Allen said, according to WPDE.

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"She carried out actions to kill and put his body in a suitcase and hide it to hide evidence of what she did, to give numerous stories to investigators, to manipulate the course of the investigation, and finally to discard Gannon inside that suitcase, off a Florida bridge like garbage." 

Defense lawyer Will Cook told the jury of 11 men and seven women Monday that Stauch suffered a "major psychotic crack" as a result of past abuse when she was a child. 

Cook said she was physically, emotionally and sexually abused at the hands of her mother’s boyfriends beginning at the age of 3 or 4, KMGH-TV reported. 

"She witnessed her mother get abused until eventually the abuse her mother endured was transferred onto her," Cook said. "It started as physical beatings and turned into sexual assault later." The attorney claimed she slipped into a "dissociative" state and "broke," believing she "was killing the demons in her life, in the dark depths of her childhood."

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After allegedly stabbing the boy repeatedly, Stauch then grabbed a handgun and fired three times at Gannon, striking him once in the head, prosecutors said Monday, according to KUSA. 

"She gathered his bloody and broken body and stuffed him into a suitcase and stored his body in the basement storage room," Allen said.

The district attorney said Stauch then took the suitcase containing her stepson's body, loaded it into a rented vehicle and took it with her as she traveled to her hometown in South Carolina. Stauch allegedly tossed the suitcase off a bridge in the Florida Panhandle, Allen said, where a bridge worker discovered the body about six weeks later. 

Initially, authorities said they responded after Stauch said Gannon had not returned from playing with a friend. But she did not provide the names of any friends he may have been with or their parents. Within days, she concocted a variety of stories to mislead them, including that a man she hired to repair a carpet raped her and then abducted Gannon, investigators say. 

More than 200 volunteers conducted searches for the boy in the area where the family lived near Colorado Springs as authorities investigated. 

About two weeks after Gannon disappeared, searchers found a piece of particle board with Gannon's blood on it in a rural area nearby. Presuming the boy to be dead, authorities arrested Stauch in Myrtle Beach March 2, 2022. Gannon's remains were found later that month in the small city of Pace in northwestern Florida. 

In his opening, Allen said the boy, who was born premature, "proved to be a fighter," reportedly prompting his mother, Landon Hiott, to run from the courtroom overcome with emotion. 

Stauch was charged with first-degree murder, tampering with a deceased human body and tampering with physical evidence. 

After her arrest, she was also accused of trying to escape from jail. Court documents allege she asked a fellow inmate to help her get out, explaining she planned to use a broom handle to break the window in her cell and that she had already measured herself to make sure she could fit through.

The Associated Press contributed to this report.