WASHINGTON (CBS)—Authorities have arrested a woman they say threw her own urine on a bus driver in Washington, DC.

It happened over the weekend near Minnesota Avenue and Benning Road, Northeast.

Police say the suspect was leaving the bus when the Metro operator told the woman to “ have a nice day.”

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That’s when police say the suspect responded, “Are you talking to me?”

After the bus driver responded, police say the suspect then took a purple cup that was filled with urine and poured it onto the driver.

On Wednesday Metro police say they arrested Opal L. Brown, 38, of Southeast Washington, DC.

The bus operator, an adult female, was taken to a local hospital to be decontaminated.