FBI executes search warrant in ricin letter case

The FBI and other law enforcement agencies are executing a search warrant in the case of two letters containing the deadly poison ricin that were intercepted this week at a post office in Washington state.

Police say the investigation has focused Saturday morning on a neighborhood near downtown Spokane.

The FBI, U.S. Postal Inspection Service and Spokane police are involved.

Other details are not immediately available.

Ricin is a deadly poison made from castor beans. Two letters containing the substance were intercepted at the downtown Spokane post office on Tuesday. There were no injuries.