Election security updates: CISA says election saw only 'minor' disruptive activities

Former President Donald Trump falsely claimed on social media Tuesday afternoon that there is "a lot of talk about massive CHEATING" in Philadelphia -- despite no evidence to support those claims.

Philadelphia District Attorney Larry Krasner said Tuesday that they "do not have reports of anything that looks like voter fraud ... We do not expect to have it, but if it's there, we want to know about it. We don't want to hear a bunch of crazy fiction later about how things happen."

"If we start to hear about it at nine o'clock after the polls are closed, you should be rightly suspicious of what you are hearing," Krasner said.

The post comes as Trump has for days basely accused the key battleground state of cheating.

"If Donald J. Trump has any facts to support his wild allegations, we want them now. Right now," Krasner said. "We are not holding our breath."

In a separate statement, the Pennsylvania Department of State said, "Pennsylvania counties, including Philadelphia, are running a safe and secure election."

-ABC News' Olivia Rubin and Chris Boccia

Russia-linked bomb threats to Georgia polling locations "came through the internet" and were in Cyrillic letters, according to Georgia Secretary of State Brad Raffensperger.

"So you know it came from Russia, so that helped us save some time on that one," Raffensperger said at a press briefing.

Two polling locations in Fulton County were evacuated briefly Tuesday morning after officials received five bomb threats the county later deemed to be non-credible, Raffensperger said.

Raffensperger also noted Tuesday evening that "just over 800,000" voters had cast their ballot in-person on Tuesday. He said he expects that by the end of the night "north of 1.1 million" votes will be cast.

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Georgia election officials get fake bomb warnings from Russian emails

Secretary of State Brad Raffensperger confirmed that none of the warnings were real and a few Fulton County polling locations had to close briefly. Voting in the state has otherwise gone smoothly.

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Four polling locations in Navajo County, Arizona, received bomb threats, according to the state's top election official.

"As to bomb threats in Arizona, the threats pertained to four specific locations in Navajo County only," Arizona Secretary of State Adrian Fontes said at a press conference. "These are unsubstantiated threats."

Fontes said his office has reason to believe the threats are from Russia, but clarified that hasn't been confirmed.

"I don't know that I'm at liberty to reveal anything more than my solid suspicion grounded in information that I don't know that I can share yet," Fontes said.

No polling locations were closed due to the bomb threats, Fontes said.

Isolated voting delays at several polling places around the country have prompted local officials to seek voting-hour extensions, which typically happens during every election cycle.

Among those sites whose hours have been extended are the following:

Cobb County, Georgia (20 minutes)
A judge granted Cobb County's request to keep two polling locations open an additional 20 minutes until 7:20 p.m. ET because of delayed openings due to "equipment issues," the county said in a statement.

Gwinnett County, Georgia (58 minutes)
A judge granted Gwinnett County's request to keep two polling locations open for an additional 58 minutes until 7:58 p.m. ET due to a security threat prompted a temporary evacuation earlier today.

Luzerne County, Pennsylvania (90 minutes)
A judge granted Luzerne County's request to extend voting for 90 minutes until 9:30 p.m. ET after one polling location in Laflin opened late.

Cambria County, Pennsylvania (2 hours)
A Pennsylvania judge ordered voting hours to be extended for two hours in Cambria County after scanners there were not able to read ballot markings and tabulate votes.

Wilson County and Burke County, North Carolina (30 minutes)
The North Carolina State Board of Elections approved extending the voting hours by 30 minutes at two precincts after both opened late this morning due to technical issues.

Fulton County, Georgia (various)
Due to threats today that required brief evacuation of five different polling locations, the Superior Court of Fulton County issued a ruling this afternoon allowing extension of voting hours at the Etris Darnell Community Center until 7:45 p.m. ET, C.H. Gullatt Elementary School until 7:15 p.m. ET, Southwest Arts Center until 7:43 p.m. ET, Northwood Elementary School until 7:45 p.m. ET and Lake Forest Elementary School until 7:10 p.m. ET

-ABC News' Luc Bruggeman