Meeks's office immediately called the Capitol Police when the substance was found.
Lafargue said the powder was found sometime around noon.
This incident follows multiple mailings of ricin, a deadly poison made from castor beans, to a number of elected officials, including Sen. Roger WickerRoger WickerMenendez rails against Puerto Rico bill for 4 hours on floor Rubio will run for reelection Lawmakers push first responder network on rural service MORE (R-Miss.) and President Obama.
Since the ricin-laced letters were discovered, the FBI has been investigating.
Over the weekend law enforcement charged James Everett Dutschke with sending the letters. Dutschke was arrested Saturday by federal marshals.