Photo taken on Feb. 9, 2022 shows Dunbar High School in Washington, D.C., the United States. (Xinhua/Liu Jie)

Police in Washington, D.C. said on Wednesday afternoon they are investigating bomb threats made to six schools around the U.S. capital.

The schools, including Dunbar High School, are currently being evacuated, the Metropolitan Police Department tweeted.

The evacuations came a day after U.S. second gentleman Doug Emhoff was escorted out of an event at Dunbar High School due to a bomb threat.

More than a dozen historically black colleges and universities (HBCUs) around the the United States also received bomb threats in early days of this month dedicated to honoring achievements and struggles of African Americans throughout U.S. history.

A law enforcement official has said the FBI has identified six persons of interest around the country, all juveniles, who are suspected of making the threats against the HBCUs.

The official added they appear to be "tech savvy," using sophisticated methods to try to disguise the source of the threats, which appear to have a racist motivation.