Authorities investigate ‘suspicious substances’ mailed to congressional officesCorroborated by 2 sources from 2 publishersuspolitics15h agoTL;DRSources1POLITICO Congresshttps://www.politico.com/live-updates/2026/10/15/congress/suspicious-substances-letters-congress-0112042315h ago2ABC News Politics Headlineshttps://abcnews.com/Politics/wireStory/authorities-investigate-letters-suspicious-substances-congressional-election-offices-13729037715h ago