"While none of the mail received and tested thus far has been found to be harmful, it is clear that the person sending these letters is organized and committed, and the potential to do harm remains very real," Senate Sergeant-at-Arms Terrance Gainer said in a Thursday letter to the Senate community.
Gainer has also said more letters could be on the way.
In statements to Roll Call, spokesmen for Coats and Roberts said the Senators were out of the office during the scares and that testing at Coats' office showed the substances were harmless.
Lieberman spokeswoman Whitney Phillips described the Hartford office's mailing as a "package" that prompted a decision to ultimately evacuate the office and have district staff telecommute on Friday.
Initial tests of the powdery substance came back negative for hazards, Phillips continued; further testing will illuminate what the substance actually is.
Back in Washington, the Capitol Rotunda briefly shut down Friday morning when a mysterious powder was detected on the floor. Capitol Police put the substance through routine testing and it was found to be just smashed-up candy from a candy necklace, Schneider said.
From left, Lisa Peng, daughter of Peng Ming, Grace Ge Geng, daughter of Gao Zhisheng, and Ti-Anna Wang, daughter of Wang Bingzhang, hold pictures of their imprisoned fathers during a House Subcommittee on Africa, Global Health, Global Human Rights, and International Organizations hearing in the Rayburn House Office Building titled “Their Daughters Appeal to Beijing: ‘Let Our Fathers Go!’”
Each year since 1990, CQ Roll Call has reviewed the financial disclosures of all 541 senators, representatives and delegates to determine the 50 richest members of Congress. This year's report, derived from forms covering the calendar year 2012, shows it took a net worth of $6.67 million to crack the exclusive club.