Another bomb threat was reported at a HBCU this week. Here's where the investigation stands

Spelman College, a historically Black institution, received another bomb threat this week -- and just days after a round of threats rattled more than a dozen HBCUs across the US.

This was the third threat to the all-women school this year, and it prompted all classes to be canceled and a four-hour campus lockdown on Tuesday, according to a tweet from the school.

Following the series of HBCU bomb threats that started last month, the Southern Poverty Law Center hosted a roundtable with several HBCU leaders Tuesday to discuss recent attacks on their schools.