There she saw the new king standing by the column at the entrance of the Temple, as was the custom. He was surrounded by the officers and the trumpeters, and the people were all shouting joyfully and blowing trumpets. Athaliah tore her clothes in distress and shouted, "Treason! Treason!" 1
References for 2 Kings 11:14
11.14 2 K 23.3.