Fox News says it has confirmed that a suspicious letter has been sent to Sen. Jeff Flake's office in Pheonix, Arizona. No additional details about the contents of the letter or its origin have been reported.
Flake is yet another lawmaker in a recent string to have been sent a suspicious letter following the deadly bombings that rocked the Boston Marathon on Monday.
Earlier Wednesday, Michigan senator Carl Levin said one of his regional offices received a “suspicious-looking letter," one day after letters sent to a Republican senator Roger Wicker and to President Barack Obama tested positive for ricin.
This is a breaking story. Please check back for updates.