Six people were killed and 14 others wounded, including U.S. Rep. Gabrielle Giffords, when a gunman opened fire in front of a Safeway supermarket in Tucson, Arizona, authorities said. The congresswoman had been hosting a meeting with constituents Saturday morning when the attack began.

Rep. Gabrielle Giffords, D-Arizona, sent an email the night before she was shot at an event in Tucson calling for a more civil tone in politics.

Giffords offered congratulations to Kentucky Secretary of State Trey Grayson, a Republican, after he was named Director of Harvard University’s Institute of Politics on Friday.

“After you get settled, I would love to talk about what we can do to promote centrism and moderation,” Giffords wrote in the email, provided to CNN by Grayson. “I am one of only 12 Dems left in a GOP district (the only woman) and think that we need to figure out how to tone our rhetoric and partisanship down.”