Election security: Officials say 2024 election saw only 'minor' disruptive activities
Voting hours were extended at a number of polling sites due to technical issues.
From the polling place to the courtroom, ABC News tracks the latest election security developments on Election Day 2024 as experts warn about the spread of misinformation and disinformation from within the U.S. and abroad.
Security experts stress that the nation's voting infrastructure is highly secure, and that isolated voting issues do not indicate widespread election fraud.
For coverage of each race, see our election updates.
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How to watch ABC News coverage of Election Day
On Election Day, voters around the country will eagerly wait to hear if former President Donald Trump or Vice President Kamala Harris comes out on top in the race for the White House.
ABC News will have full coverage of the presidential election results and many other key down-ballot races on Election Day and the days afterward as votes continue to get counted.
Here's how to watch ABC News live coverage of 2024 election results.
Arizona polling sites received 'unsubstantiated' bomb threats
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.
Officials extend voting hours at some sites following delays
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
Federal judge rejects RNC lawsuit seeking to block GA voters from hand-returning mail-in ballots
A federal judge has rejected an RNC lawsuit seeking to block some Georgia counties from accepting ballots that were hand-delivered over the weekend and Monday, according to Marc Elias, a lawyer working for Vice President Kamala Harris' campaign.
Judge R. Stan Baker -- who was appointed by former President Donald Trump -- said the lawsuit from Republicans "does not withstand even the most basic level of statutory review and reading comprehension," per Elias.
Republicans had claimed that the seven Georgia counties that were accepting hand-delivered mail-in ballots after the early voting period were violating the law.
-ABC News' Olivia Rubin
Voting hours extended at 2 North Carolina polling places
The North Carolina State Board of Elections approved extending the voting hours at two precincts after both opened late this morning due to technical issues.
The Gardners School precinct in Wilson County and Pilot Mountain Precinct in Burke County will be open for 30 additional minutes.
The extended hours in the two countries will not impact the timing of results for the rest of the state, authorities said.
-ABC News' Peter Charalambous