The second floor of the EPA building is on lockdown as authorities investigate a suspicious package, hazmat teams were on the way, NBC News reported, citing officials.
The Federal Protective Service responded to the situation and cleared the room where the suspicious package was located, NBC News reported citing an EPA official.
EPA employees were sent an "all clear" message after the authorities investigated the incident, the report said citing the official.
READ MORE: US Environmental Agency Chief Bans Use of Confidential Scientific Studies
Meanwhile, the Agency has announced the departure of two top aides amid ethics investigations.
Albert "Kell" Kelly, who led the agency's Superfund program that helps clean up hazardous sites has resigned along with Pasquale "Nino" Perrotta, the head of Pruitt's security detail.
Earlier, Environmental Protection Agency (EPA) administrator Scott Pruitt proposed a rule outlining new standards that dictate which scientific studies can be used when writing agency regulations.