At least three inmates of a prison in the southern Russian city of Rostov-on-Don who took employees hostage during an escape bid on Sunday morning were killed by security forces in a storming operation, officials said. According to authorities, the men who tried to break out of the remand facility were accomplices of the Islamic State terrorist organization. During the storming operation, “the criminals were eliminated, the employees who were held hostage have been released and are safe,” the Russian penitentiary service told the state news agency TASS. It was initially reported that six men t…