Heart-breaking: A colleague of mine who is a Muslim just tapped my shoulder. "I'm leaving." The newsroom? I asked... "No. the country."
A Homeland Security official confirms the @ABC report: no gun found, crowd panicked as a guy tried to raise a sign; someone shouted "gun."
It's ok to retweet official sources. But when those sources are in error, and involve innocents, we must correct it as quickly as possible.