A 15-year-old schoolgirl from Guyana was charged Monday as an adult for the murder of 19 people after police accused her of purposefully setting fire to a school dormitory in retaliation for her cell phone being confiscated.

The fire killed 18 of her schoolmates and a five-year-old boy trapped inside the building after a dorm matron locked the doors from the inside to prevent the female students, aged 12-18, from sneaking out to socialize with males from a nearby mining town. 

How the fire was started has not yet been made clear. 

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A court south of the capital of Georgetown ordered that the 15-year-old girl be held in custody pending further hearings after she appeared virtually for the proceedings Monday.

She has not yet been permitted to plead guilty or not guilty to the charges and will appear for another court hearing July 5. 

State and defense attorneys will then decide whether they are ready to start a preliminary trial.

The 15-year-old could face up to life in prison if she is found guilty of purposefully setting fire to the Mahdia Secondary School earlier this month.

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The school, a government boarding school that serves remote indigenous villages in the country’s southwest, was found ablaze shortly before midnight May 21.

Some two dozen students were injured as firefighters worked to rescue them from the burning building heavily constructed with iron grills. 

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Another 20 students were also rescued.

One of the critically injured students was sent to a hospital in New York for specialist treatment, though the majority of the injured students have been discharged. 

The Associated Press contributed to this report.