Partial results from Israel's general election show veteran Prime Minister Benjamin Netanyahu is leading his rival, former military chief Gadi Eisenkot, but is still short of a majority in parliament.
With 85% of ballots counted, Netanyahu's Likud party and its far-right and ultra-Orthodox Jewish allies were on track to win 53 seats in the 120-seat Knesset. Eisenkot's Yashar party and three other Jewish opposition parties in his bloc were set for 48.
Both leaders have said they will try to form a governing coalition.
Arab-led parties, who are on course to win an unprecedented 19 seats, could emerge as kingmakers, but all but one of the Jewish parties have pledged not to work with them.
With between 430,000 and 480,000 absentee ballots from soldiers and diplomats yet to be counted, it could still take a day or two for the final election results to emerge.
Once they are confirmed, President Isaac Herzog will hold consultations with all the political factions and invite the leader whom he believes has the best chance of success to form a government - a process that could take weeks.
If they fail, then ultimately there would have to be another election.
During a meeting at his residence in Jerusalem, Herzog praised the 77.7% turnout in Tuesday's election, which was the country's highest in more than two decades.
"It is a badge of honour for Israeli society, and it was remarkable to see how deep the desire for democracy is in Israel," he said.
He added that he expected to receive the official results next week, after which he would begin discussions with every faction.
"We must do everything we can, certainly after yesterday, to avoid another round of elections. So, I expect everyone who comes here to come with an open mind."
Both the prime minister and his main rival have insisted that they should be tasked with forming a governing coalition.
Eisenkot declared that the public had "spoken in favour of change", after initial exit polls published by three Israeli broadcasters projected that his "Change Bloc" would emerge with between 52 and 53 seats in the Knesset, compared to 50 seats for Netanyahu's bloc.
"The coalition of failure has lost the people's trust," he told supporters at Yashar's election headquarters in Tel Aviv. "I will work with my partners to ensure that the people's decision is translated into a Zionist government."
Later, the broadcasters updated their exit polls, with two projecting that the rival blocs would be tied on 51 seats and one giving Netanyahu's bloc a narrow three-seat lead.
Netanyahu then appeared at Likud's headquarters in Jerusalem and declared that his right-wing bloc had won a "great majority".
"We must put in place a strong right-wing national government," he said. "It is forbidden, simply forbidden, to endanger Israel by forming a government that relies on anti-Zionist Arab parties."
The leader of the left-wing Democrats party told its partners in Eisenkot's bloc on Wednesday that there was an "opportunity to form a change government in partnership" with the Arab parties and replace Netanyahu's coalition.
"We have no future here if we don't stop being afraid. And if we don't put an end to racism," Yair Golan wrote on X.
The two Arab parties - the United Arab List and the Joint List - appear to be heading for record representation because of a strong turnout among Arab Israelis, who account for about a fifth of the population and often describe themselves as Palestinian citizens of Israel.
The chairman of the Joint List, which has talked of providing an electoral "safety net" for the Jewish opposition, said on Wednesday that it was "ready and prepared to pave the way to oust the Netanyahu government".
"Change runs through a Jewish-Arab partnership - a genuine and equal partnership. Nothing less, and nothing more," Yousef Jabareen wrote on X.
United Arab List leader Mansour Abbas, who served in a short-lived governing coalition formed after the 2021 elections, said on Tuesday night that he hoped "the numbers will work out and we, the Change Bloc and the UAL, can ensure that there are 61 Knesset seats".
Tuesday's election was the first since the deadly Hamas-led attacks on Israel on 7 October 2023 and the wars that followed in Gaza, Lebanon and Iran.
It was also seen by Israelis as one of the most consequential in the country's history, because it could decide not just their leadership but whether the country continues on its current hardline, religious-nationalist trajectory.
Key campaign issues included accountability for the security failures that led to the 7 October attacks, the conduct of regional wars, conscripting ultra-Orthodox Jewish men into the military, judicial reforms and Israel's international standing.
