Authorities have returned to a Texas home linked to the investigation into ricin-tainted letters sent to New York City's mayor and President Barack Obama.
FBI agents wearing hazardous material suits were seen going in and out of the house in New Boston Wednesday. The house also was searched last Friday.
A law enforcement official has told The Associated Press that the search was initiated after the resident's spouse contacted the FBI. The official wasn't authorized to disclose information and spoke to the AP Saturday on condition of anonymity.
Davilyn Walston, the spokeswoman for the U.S. attorney's office in the eastern district of Texas, confirmed Wednesday that a ricin investigation is ongoing in the district but declined to provide details.
New Boston is near the Oklahoma and Arkansas borders.
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