Bulgaria’s chief prosecutor launched an investigation Friday into the country’s soccer management, with the focus on the actions of federation president Borislav Mihaylov. Bulgaria’s prime minister also increased the pressure on Mihaylov by writing a letter to FIFA President Gianni Infantino urging the world governing body to take “decisive action” by removing him as federation leader and installing an interim management. The moves follows the mass protests that gripped Bulgaria’s capital on Thursday as several thousand soccer fans took to the streets to demand the resignation of Mihaylov, the goalkeeper in Bulgaria’s storied run to the semifinals at the 1994...