Police in Maryland announced Thursday the arrest of a black man who they said threatened on Twitter to kill all white people in the Charles County town of La Plata. Carlos Anthony Hollins, a 20-year-old resident of Waldorf, Maryland, has been charged with threats of mass violence for allegedly sending the tweet Wednesday afternoon, according to a report by local ABC affiliate WJLA-TV.

Hollins was being held on $250,000 bond, according to reports. No further information about the incident had been released Thursday afternoon.

The tweet allegedly sent by Hollins reads, authorities say: “IM NOT GONNA STAND FOR THIS NO. MORE. TONIGHT WE PURGE! KILL ALL THE WHITE PPL IN THE TOWN OF LAPLATA #BlackLivesMatter.” The Twitter account associated with the tweet, “@_TRYCOCAINE,” was suspended after police were notified.

The La Plata Police Department deployed additional officers to patrol the streets following the threat and multiple police agencies were involved with the investigation Wednesday, the local CBS affiliate WJZ-TV reported. It remained unclear what prompted the threat.

La Plata is about 65 miles south of Baltimore, where the case of six police officers charged in the April death of 25-year-old Freddie Gray got a hearing in a city court Wednesday. About 75 protesters allied with Black Lives Matter, a social justice movement that has spread around the U.S. in recent years, clashed with police outside of the Baltimore City Courthouse East.

At least one person was arrested during the protest, police confirmed. Activists have called for an end to police brutality in the Baltimore City police department and for justice in Gray’s case, which sparked days of rioting, looting and arson in Maryland's largest city in April.

South Carolina Gov. Nikki Haley gave a speech Wednesday in Washington, D.C., during which she denounced the Black Lives Matter movement “that has laid waste” to Baltimore and Ferguson, Missouri, where a different young black man was killed by police last August. Haley said activists should learn from the community of Charleston, South Carolina, which did not erupt in violence after the hate-fueled mass shooting at a historically black church that left nine worshipers dead in June.