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WASHINGTON (WUSA9 ) -- The FBI is investigating another white powder call at Georgetown University, according to a DC Fire/EMS spokesperson.* Law enforcement has secured the area in the 3700 block of O St. NW (Graduate School of Arts and Sciences) Tuesday morning.

Tuesday morning, Georgetown University alerted DC Fire & EMS of possible ricin in one of the residence halls on campus, according to a police spokesperson.

Initial field tests for biological agents in the area were negative and DC Fire EMS advised there was no immediate risk to the area, says the spokesperson.

Police say students were told they could remain in all campus buildings.

Law enforcement authorities have recovered a substance from reported location, according to police, and will be conducting further testing of that material.

A suspect has also been identified and interviews are ongoing, says a police spokesperson.

A spokesperson says the university is cooperating with D.C. and federal authorities in the ongoing investigation.

Georgetown police sent out the following message:

Dear Members of the Georgetown Community,

I am writing to update you on a situation that developed on campus overnight.

Early this morning, the university alerted DC Fire and EMS of a report of a possible hazardous substance in McCarthy Hall. DC Fire and EMS responded and performed tests for biological agents in McCarthy Hall, which were negative. DC Fire and EMS advised there is no immediate risk to the area. Students may remain in McCarthy Hall and in all surrounding buildings.

Law enforcement authorities now have a substance that is possibly ricin in their possession. They will be conducting further testing of that material. A subject has also been identified and interviews are ongoing.

This is an active investigation so you may see an increased presence of law enforcement authorities on campus. The university is cooperating with local and federal authorities on this ongoing investigation.

Anyone with any information on this ongoing investigation should contact Georgetown Police Department at 202-687-4343.

Sincerely,

Jay Gruber

Chief of Police

Georgetown University

*EARLIER STORY:

Officials with the Metropolitan Police Department say a white powdery substance found in one of the dorms at Georgetown University on Tuesday morning tested negative.

No one was injured and no one was evacuated during the incident, according to officials.

The powdery substance was found in McCarthy Hall at approximately 3:28 a.m.

The area was deemed safe.

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