In today’s newsletter: Javier Milei was expected to top the first round of voting in the presidential election, but the country picked the centrist candidate

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Good morning. Today we’re heading to Buenos Aires, where left-wing and centrist Argentinians have taken to the streets celebrating that the country may be about to avoid electing a far-right president described by some as a mashup of Donald Trump, Boris Johnson and The X-Men’s Wolverine – who describes himself as “anarcho-capitalist”.

Until the results of the first round of Argentina’s presidential election trickled out early yesterday morning, the polls and the pundits had predicted that eccentric far-right populist Javier Milei – whose signature mop of untamed hair and long sideburns is a professionally designed homage to Elvis and the aforementioned superhero – would probably become the country’s next president.

Israel-Hamas war | The US has said now is not the time for a ceasefire between Israel and Hamas, as the UN reports that some Palestinians who fled their homes in the north of Gaza have returned due to a lack of food and shelter in the south. On Monday, White House national security spokesperson John Kirby told CNN that Israel still had “work to do to go after Hamas leadership”, echoing comments from the US president, Joe Biden, that any discussions of a ceasefire could only take place if Hamas freed all its hostages in Gaza.

Technology | Government officials are using artificial intelligence and algorithms to help decide everything from who gets benefits to who should have their marriage licence approved, according to a Guardian investigation. Kiran Stacey reports on the findings that shed light on the often uncontrolled ways cutting-edge technology is being used across Whitehall.

Protest | Downing Street has argued that police already have “extensive powers” to take action against demonstrators who chanted about “jihad” in London at the weekend, as Keir Starmer said ministers should plug any gaps in the law.

Crime | Lewis Edwards, a 24-year-old former police officer, incited more than 200 girls as young as 10 to share explicit images and videos of themselves with him via Snapchat, a court has heard.

Policing | A Metropolitan police officer is under criminal investigation over alleged racially aggravated assault after a woman was wrongly arrested for evading a bus fare. The incident was filmed and widely seen on social media.

Soft-spoken Sergio Massa’s campaigning strategy pays off while voters seem to pull back from libertarian rival – but who will win the runoff?

After a disastrous showing in Argentina’s open primaries in August, Argentina’s Peronist party made a resounding comeback this week. In the latest chapter in a rollercoaster presidential election, the soft-spoken economy minister, Sergio Massa, snatched what seemed like a sure victory from the jaws of the libertarian Javier Milei, winning 36.6% of the vote against only 29.9% for Milei.

The broad margin was still not enough to avoid a runoff on 19 November between the two most dissimilar contenders imaginable. Although beset by soaring price inflation and a 40% poverty rate, Massa trounced Milei, whose promise to dollarize the economy and legalize the organ trade had catapulted him to surprise victory in August.