Lawmakers and staff are on high alert because of letters suspected of being tainted with ricin. Now Sen. Carl Levin, D-Mich., said today his office in Saginaw, Mich., received a suspicious envelope.

The office was evacuated. Here’s Levin’s statement:

“The letter was not opened, and the staffer followed the proper protocols for the situation, including alerting the authorities, who are now investigating. We do not know yet if the mail presented a threat. I’m grateful for my staff’s quick response and for government personnel at all levels who are responding.”

Meanwhile, police are investigating the office of Sen. Richard Shelby, R-Ala., Shelby spokesman Jonathan Graffeo tells The Washington Examiner.

“The Capitol Police are investigating a suspicious package delivered to our front office,” Graffeo said.