A St. Louis Metropolitan Police officer was accidentally shot and killed in the city’s south side Thursday morning, officials said.

Authorities said the 24-year-old female officer was at the home of another officer just before 1 a.m. Thursday when a gun accidentally fired and struck her in the chest. The circumstances surrounding the shooting were not immediately clear.

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During a 2:30 a.m. news conference, Chief John W. Hayden said two on-duty officers stopped by one of their homes and an off-duty officer came by and was accidentally shot in her chest.

The officer was rushed to a hospital where she was pronounced dead. Her identity has not been released but police said she had been with the force for two years.

This is a developing news story. Check back for updates.