HARRISBURG, Pa. (AP) — A giddy if exhausted Hillary Clinton embarked on a post-convention Rust Belt bus tour just hours after becoming the first female presidential nominee of a major political party.

The celebratory mood quickly evaporated amid fresh revelations that hackers had breached a program used by her campaign and Republican nominee Donald Trump promised to sharpen his barbs.

Trump told supporters at a rally in Colorado Springs, Colorado, that there will be "no more Mr. Nice Guy." And for the first time he encouraged his supporters' anti-Clinton chants of "lock her up."

Clinton aides acknowledged that a hacking attack that exposed Democratic Party emails also reached into a computer system used by her own campaign. The FBI said it was working to determine the "accuracy, nature and scope" of the cyberattacks.

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No name-calling, personal insults or threats. No attacks based on race, gender, ethnicity, etc. No writing with your Caps Lock on – it's screaming. Keep on topic and under 1500 characters. No profanity or vulgarity. Stay G- or PG-rated.