BELGRADE, Serbia (AP) — The deadly collapse of a concrete roof at a rail station in Serbia has raised tensions across the Balkan county, fueling widespread anger toward the government and protests after the failure claimed 15 lives in the northern city of Novi Sad.

The station, a major hub, was recently renovated as part of a Serbian-Chinese partnership. Critics allege that corruption, poor oversight and inadequate construction work contributed to the Nov. 1 tragedy. Officials have offered conflicting information about whether the roof was part of the renovation, and its maintenance is under scrutiny.

The collapse became a flashpoint for broader dissatisfaction with Serbia's authoritarian rule, reflecting growing public demands for transparency while the country undertakes large infrastructure projects, mostly with Chinese state companies.

What do we know about the collapse?

Very little. The rail station was built in 1964 and renovated twice in recent years as part of a wider deal between China, Serbia and Hungary to establish a fast rail connection between Belgrade and Budapest.

Initially, authorities said the outer roof was not renovated during the work on the station, but they gave no explanation for why. Later, experts denied that, and images emerged that suggested at least some roof work was done after all.

One of the protesters' demands has been to make public all documentation in connection with the reconstruction project.

Has there been an investigation?

Authorities opened a probe immediately after the collapse, promising it would be thorough and would not spare anyone regardless of position. On Thursday, 11 people were detained.

The suspects, who have not been identified, face charges "of committing criminal acts against public security, causing public danger and irregular conducting of construction work,” the Higher Prosecutor’s Office in Novi Sad said in a statement.

Serbian media reported that Goran Vesic, who resigned as construction minister after the collapse, was among those detained.

Prosecutors said earlier that several dozen people have been questioned. The only information about the investigation so far has come from Serbian media, which published unconfirmed reports about the companies involved in the reconstruction.

Why are people protesting?

In the first days after the tragedy, Serbians protested mostly in silence, holding vigils for the victims. But as time passed, grief gave way to anger, leading to a wave of demonstrations at various locations and by different groups.

Most recently, protesters blocked a courthouse in Novi Sad, demanding that judicial authorities “do their jobs.” Riot police pushed them away from the entrance, which led to scuffles and a two-day standoff this week.

Chants such as “corruption kills” also marked the protests that demanded the dissolution of the entire government over the tragedy. Protesters left symbolic handprints in red paint on government buildings, accusing authorities of having “blood on their hands.”

How did authorities react to the protests?

Analysts say the government has sought to cushion the damage to its image by prolonging the investigation and apparently hoping that public anger will ease as time goes by.

Serbia’s authoritarian president, Aleksandar Vucic, has repeatedly urged calm and called on people to trust institutions. He has said the investigation is complicated and takes time. But Vucic also said that “responsibility cannot be avoided.”

At the same time, police detained several activists who took part in recent protests and warned that they would not tolerate any disruptions of public order, which is widely seen as an attempt to discourage people from protesting.

Why are Serbia and China teaming up on construction projects?

By building roads, railways and other infrastructure, Serbia seeks to enhance its transportation links with neighboring states, while China seeks to strengthen its economic footprint in Europe.

Serbia and China negotiate agreements mostly on a governmental level without the participation of outside bidders. Chinese state banks frequently provide loans to fund those projects. The loans may come with strings attached, such as the mandatory involvement of Chinese companies and their workers.

Although such partnerships have brought billions of dollars in investments into the developing Balkan economy, questions surrounding quality, safety and financial sustainability often remain, as highlighted by the roof collapse.

The Chinese companies that took part in the reconstruction said the concrete canopy that collapsed was not part of their work.

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Associated Press writer Jovana Gec contributed to this report.

Workers inspect a train station after an outdoor roof collapsed in Novi Sad, Serbia, Saturday, Nov. 2, 2024. (AP Photo/Darko Vojinovic)

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People light candles for the victims after an outdoor roof collapsed at a train station in Novi Sad, Serbia, Friday, Nov. 1, 2024. (AP Photo/Darko Vojinovic)

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People light candles for the victims after an outdoor roof collapsed at a train station in Novi Sad, Serbia, Saturday, Nov. 2, 2024. (AP Photo/Darko Vojinovic)

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An Orthodox icon and candles for the victims after an outdoor roof collapsed at a train station in Novi Sad, Serbia, Saturday, Nov. 2, 2024. (AP Photo/Darko Vojinovic)

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Protesters shout slogans with red paint on the hands symbolizing blood, demand arrests, two days after a concrete canopy collapsed at a railway station in Novi Sad, killing 14 people and injuring three, during protest in Belgrade, Serbia, Sunday, Nov. 3, 2024. (AP Photo/Darko Vojinovic)

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People march during a protest following collapse of a concrete canopy at the railway station in Novi Sad that killed 14 people, in Belgrade, Serbia, Monday, Nov. 11, 2024. (AP Photo/Darko Vojinovic)

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A protester points a baton at riot police inside the City Hall building in Novi Sad, Serbia, Tuesday, Nov. 5, 2024. (AP Photo/Marko Drobnjakovic)

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A photo of Serbia's president Aleksandar Vucic, left, and the country's prime minister Milos Vucevic is smeared with red paint during a protest in Novi Sad, Serbia, Tuesday, Nov. 5, 2024. (AP Photo/Marko Drobnjakovic)

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Skirmishes between Serbian police and opposition protesters demanding arrests over a deadly roof collapse at a railway station in Novi Sad, Serbia, Wednesday, Nov. 20, 2024. (AP Photo)

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Serbian police officers guard a courthouse during anti-government protest demanding arrests over a deadly roof collapse at a railway station in Novi Sad, Serbia, Wednesday, Nov. 20, 2024. (AP Photo)

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