International

Oldest human relative walked upright 7 mn years ago: study

AFP

The earliest known human ancestor walked on two feet as well as climbing through trees around seven million years ago, scientists said Wednesday after studying three limb bones.

When the skull of Sahelanthropus tchadensis was discovered in Chad in 2001, it pushed back the age of the oldest known representative species of humanity by a million years.

Nicknamed “Toumai”, the nearly complete cranium was thought to indicate that the species walked on two feet because of the position of its vertebral column and other factors.

However the subject triggered fierce debate among scientists, partly due to the scarcity and quality of the available bones, with some even claiming that Toumai was not a human relative but just an ancient ape.

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In a study published in the Nature journal on Wednesday, a team of researchers exhaustively analysed a thigh bone and two forearm bones found at the same site as the Toumai skull.

“The skull tells us that Sahelanthropus is part of the human lineage,” said paleoanthropologist Franck Guy, one of the authors of the study.

The new research on the limb bones demonstrates that walking on two feet was its “preferred mode of getting around, depending on the situation,” he told a press conference.

But they also sometimes moved through the trees, he added.

– ‘Not a magical trait’ –

The leg and arm bones were found alongside thousands of other fossils in 2001, and the researchers were not able to confirm that they belonged to the same individual as the Toumai skull.

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After years of testing and measuring the bones, they identified 23 characteristics which were then compared to fossils from great apes as well as hominins — which are species more closely related to humans than chimpanzees.

They concluded that “these characteristics are much closer to what would be seen in a hominin than any other primate,” the study’s lead author Guillaume Daver told the press conference.

For example, the forearm bones did not show evidence that the Sahelanthropus leaned on the back of its hands, as is done by gorillas and chimpanzees.

The Sahelanthropus lived in an area with a combination of forests, palm groves and tropical savannahs, meaning that being able to both walk and climb through trees would have been an advantage.

There have been previous suggestions that it was the ability to walk on two feet that drove humans to evolve separately from chimpanzees, putting us on the path to where we are today.

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However the researchers emphasised that what made Sahelanthropus human was its ability to adapt to its environment.

“Bipedalism (walking on two legs) is not a magical trait that strictly defines humanity,” paleontologist Jean-Renaud Boisserie told the press conference.

“It is a characteristic that we find at the present time in all the representatives of humanity.”

– Our ‘bushy’ family tree –

Paleoanthropologist Antoine Balzeau of France’s National Museum of Natural History said the “extremely substantial” study gives “a more complete image of Toumai and therefore of the first humans”.

It also bolstered the theory that the human family tree is “bushy”, and was not like the “simplistic image of humans who follow one another, with abilities that improve over time,” Balzeau, who was not involved in the research, told AFP.

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Daniel Lieberman, a professor of human evolutionary biology at Harvard University, said in a linked paper in Nature that the study’s “authors have squeezed as much information as possible from the fossil data”.

But he added that the research will not offer “full resolution” of the debate.

Milford Wolpoff, a paleoanthropologist at the US University of Michigan cast doubt on whether Toumai is a hominin, telling AFP that “extraordinary claims require extraordinary evidence”.

Wednesday’s study was carried out by researchers from the PALEVOPRIM paleontology institute, a collaboration between France’s CNRS research centre and Poitiers University, as well as scientists in Chad.

Guy said the team hopes to continue its research in Chad next year — “security permitting”.

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Chadian paleontologist Clarisse Nekoulnang said the team was “trying to find sites older than that of Toumai”.

International

Petro accuses top guerrilla leader of bribing officers to evade military strikes

Colombian President defends his government's social reforms

The president of Colombia, Gustavo Petro, said Saturday that the country’s most wanted guerrilla leader is bribing members of the security forces to obtain advance information and evade military operations.

According to the government, Iván Mordisco, a dissident leader of the now-defunct FARC, is currently on the run in the जंगल following an الجيش bombardment last week that killed six of his closest collaborators in the department of Vaupés.

Authorities believe the guerrilla commander had been at the site shortly before the operation. “He buys off the commanders who are supposed to capture him; that’s how he escapes the bombings, but leaves his own people to die. He is warned before every strike,” Petro wrote on social media platform X.

The six individuals killed in the strike were part of Mordisco’s security ring, according to Defense Minister Pedro Sánchez.

Local media reported that one of those killed was a woman known as “alias Lorena,” who was allegedly Mordisco’s partner and the mother of his child.

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After failed attempts to negotiate peace, Petro’s administration has shifted to a more aggressive military strategy against the guerrilla leader. In recent months, three of Mordisco’s brothers have been captured and now face charges including homicide, kidnapping, and arms trafficking.

Central America

Costa Rica urges China to halt actions against Panama-flagged vessels

The government of Costa Rica on Saturday called on China to halt retaliatory actions against vessels flying the Panamaflag, amid escalating tensions over control of two strategic ports linked to the Panama Canal.

In a statement shared on social media, Costa Rica’s Foreign Ministry warned that the situation “puts global trade at risk” and expressed its “deep concern and strongest condemnation” over what it described as “arbitrary and unjustified delays and inspections in Chinese ports.”

The Costa Rican government urged “full respect for international law, particularly the United Nations Convention on the Law of the Sea,” while reaffirming its “unconditional support and solidarity” with Panama.

San José’s position aligns with growing international criticism from countries including Honduras, Peru, Paraguay, Israeland Ukraine.

Paraguayan authorities described the detentions as “unacceptable” and pointed to what they called “undue pressure” on the Panamanian government.

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International

Mexico leads global cases of enforced disappearances, UN report finds

Mexico accounts for the highest number of urgent actions related to enforced disappearances worldwide, according to the latest report by the UN Committee on Enforced Disappearances.

The report, released by I(dh)eas, indicates that Mexico has accumulated 819 cases between 2012 and February 2026, representing 38% of the global total.

In the past five months alone, 40 new urgent requests have been recorded — more than one-third of all such actions worldwide during that period.

The report warns that this trend reflects a structural problem, as the urgent action mechanism — originally intended as an exceptional measure — has become routine in Mexico.

Although the Mexican state formally complies with response deadlines, the Committee identified significant shortcomings in the implementation of these measures. These include the lack of comprehensive search plans, delays in key investigative procedures such as video surveillance and phone data analysis, and insufficient inquiries into possible links involving state agents.

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The report also highlights inadequate protection for relatives and individuals involved in search efforts, including cases of reprisals.

Among the most serious incidents documented is the disappearance of a father who had denounced alleged involvement of authorities in his son’s case in the state of Guanajuato.

The accumulation of cases could lead to the application of Article 34 of the Convention, which would allow for the launch of an international investigation into systematic enforced disappearances.

Geographically, the state of Chiapas accounts for 30% of the new urgent actions, many of them linked to collective disappearances of migrants.