Democratic candidate Joe Biden has pulled ahead of Donald Trump in Georgia, a key state in the US presidential race, voting data shows.
Mr Trump must win Georgia to leave him with a path to win.
According to the most recent data, Mr Biden is leading in the state by 917, with most votes now counted.
With its 16 electoral votes, winning the state would put Mr Biden just one shy of the crucial 270 threshold needed to win the presidency.
If Mr Trump does not win Georgia, the most electoral college votes he could possibly get is 269, which would leave the candidates in an unprecedented draw.
No news organisation has yet projected the state as a Biden win. Authorities in the state have said they hope to have a result on Friday.
The cliff-hanger follows one of the bitterest campaigns in living memory.
What’s the current state of the race?
Joe Biden now has 253 electoral college votes, while Republican Mr Trump has 214. To win the White House, a candidate needs 270.
In addition to Georgia, counts are continuing in four states with razor-thin margins – Pennsylvania, Arizona, Nevada and North Carolina.
A win in just Pennsylvania, which has 20 electoral college votes, or two of the other four remaining states would be enough to confirm Mr Biden as president-elect, barring any legal challenge.
Mr Trump, meanwhile, needs to win Pennsylvania and three of the remaining four states:
- Pennsylvania Secretary of State Kathy Boockvar told a press conference that most ballots would be counted by Friday, but the race was still too tight to declare a result. Mr Trump is now leading in the state by fewer than 20,000 votes
- Mr Trump has cut the Democratic candidate’s lead in Arizona to about 7,000 votes. The BBC’s partner CBS News has categorised the state, which carries 11 electoral college votes, as a “likely” win for Mr Biden
- Mr Trump had a lead of more than 76,000 in North Carolina (15 electoral votes) with 96% of votes tallied
- In Nevada, Mr Biden had an edge of more than 11,000 over Mr Trump. The state has six votes under the electoral college system. An election official there said the results from more than 51,000 postal ballots would be updated on Friday
A senior Trump administration official told CBS Mr Trump did not plan to concede if Mr Biden ultimately declared victory.