Eight victims in Lincoln County were killed at three different locations on Saturday night.
The probe into the racist prison gang culminated with murder convictions and halted its march toward consolidation.
Campaigners said it is "frightening" that an ally has had to issue such a warning.
Mississippi's "religious freedom" law, a look at Jerry Brown's career, how Ted Cruz could become president and more in this week's top political stories.
Despite what evangelicals say, God’s OK with you selling baked goods to a gay couple.
The law allows businesses and individuals to refuse to serve LGBT people on the basis of religion.
The student senate last week voted 33 to 15 to take down the flag.
Shannon Lamb, who taught social science and geography at Delta State University, gave no motive for the killings.
The school is in lockdown and the suspect is at large, officials confirmed.
A young Mississippi couple allegedly planned to travel to Turkey and then cross the border into Syria to join ISIS.
A 24-year-old suspect was arrested and is in custody at the Madison County jail.
Marvin Banks, 29, and Joanie Calloway, 22, were each charged with two counts of capital murder.
Chris McDaniel refused to concede defeat to Republican U.S. Senator Thad Cochran in Mississippi's primary runoff
Officials say the fuss is unlikely to lead to new electoral laws
Veteran U.S. Senator Thad Cochran of Mississippi won in part thanks to black voters