A letter addressed to President Barack Obama and Senator Roger Wicker has tested positive for Ricin poison, according to the Secret Service.

The letters arrived at a postal facility and is not near the White House or Capitol Hill.

“This facility routinely identifies letters or parcels that require secondary screening or scientific testing before delivery,” Donovan said.”The Secret Service is working closely with the U.S. Capitol Police and the FBI in this investigation.”

The letter sent to the President is similar to the one sent to Senator Wicker, according to law enforcement.