An envelope addressed to the White House and intercepted by US authorities contained a substance identified as ricin, a deadly poison that appeared to have been sent from Canada, the Royal Canadian Mounted Police (RCMP) said on Saturday.

from Times of India https://timesofindia.indiatimes.com/world/us/envelope-with-deadly-poison-ricin-addressed-to-white-house-intercepted/articleshow/78212458.cms