The Washington, D.C., headquarters of the Council on American-Islamic Relations, a prominent advocacy and anti-discrimination group, was evacuated Thursday after the receipt of a letter containing white powder, reports The Washington Post. Authorities concluded from a preliminary investigation that the substance did not appear to be dangerous.
Ibrahim Hooper, a spokesman for CAIR, as the nonprofit is known, said a poof of powder emanated from the envelope when an employee opened it. The letter contained a hateful message, he said, and FBI officials are investigating further. A few people who came in contact with the substance were quarantined to be checked by first responders, while some 20 other staff members waited outside.
Mr. Hooper said CAIR routinely receives threats online or by telephone but rarely by mail. He said the volume of threats has increased following the Paris and San Bernardino terrorist attacks.