A 17-year-old girl and another 16-year-old student were arrested at a Central Florida high school after a teacher was knocked unconscious and another poisoned on the same day, according to Local 6 News.

Police responded to St. Cloud High School after Nicholas Fish allegedly put a potentially deadly chemical into a chemistry teacher's drink.

Witnesses said the teen took the ammonium dichromate during a science demonstration in St. Cloud High School and dropped it into the teacher's coffee cup, according to an Associated Press report.

"The kid took the chemical and put it in the teacher's coffee when she was not looking," St. Cloud police Chief Pat Kelly said. "Fortunately for the teacher, other students saw it and went to the teacher and told her."

The students may have saved the teacher's life because several doses of the chemical can cause organ failure, Local 6 News reported.

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Teacher Knocked Unconscious, Another Nearly Poisoned

"On a scale of 1 to 4 of seriousness, it rated a number 4," Kelly said. "It's a carcinogenic."

Fish faces a charge of poisoning food or water, a first-degree felony.

At about the same time, police arrested a 17-year-old girl after she allegedly knocked another teacher unconscious in a dispute over a cell phone, Local 6 News reported.

"When the teacher took the phone away from the young girl, the girl became combatant and grabbed the teacher, spun her around, took her phone away and allegedly pushed her back," Kelly said. "When the teacher went back she hit herself on the wall."

The teacher lost consciousness and was transported to a local hospital, Local 6 News reported.

Both students face felony charges.

Watch Local 6 News for more on this story.