Atlanta (CNN) The Georgia attorney general is investigating a racist text that was sent to Atlanta Mayor Keisha Lance Bottoms Wednesday night, a spokesman for the mayor confirmed.

The investigation comes after 15 state lawmakers sent a letter to Georgia Attorney General Chris Carr saying they were very concerned about the "hateful message" and requested his office "immediately investigate" to ensure it wasn't sent from a state employee.

In a Wednesday night tweet, Bottoms said she received a text addressing her by the n-word and demanding, "just shut up and RE-OPEN ATLANTA!"

The mayor shared the text message on Twitter.

Her 12-year-old son received the same text, she later told the city council. When Bottoms opened the text on her phone, she said, her daughter was looking over her shoulder as she read it.

Bottoms included in her tweet, "I pray for you. 'Conscientious stupidity or sincere ignorance'" -- a nod to the Rev. Martin Luther King Jr.'s assertion that nothing is more dangerous than these two human characteristics.

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