Tens of thousands of Slovaks took to the streets on Thursday to demand the ousting of police chief Tibor Gaspar over his handling of reporter Jan Kuciak's murder and failure to curb the country's rampant corruption problems.

An estimated 45,000 people are estimated to have taken part in the mass rallies, 30,000 in the capital of Bratislava alone. The latest demonstrations are the largest since protesters forced Prime Minister Robert Fico to step down in March.

Read more: Slovakia: Has the EU looked the other way for too long?

The murder of 27-year-old investigative journalist Kuciak and his girlfriend in February cast a spotlight on the high levels of alleged corruption among politically connected businesspeople inside the European Union member state. Police said they believe that the reporter's murder was "most likely" related to his investigation into alleged ties between top politicians and the Italian mafia.

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Slovaks demand sweeping change

Protesters denounced Gaspar for failing to crack down on corruption during his time as police chief, and called for a new law that would prevent the interior minister from naming a successor.

"The new government hasn't done anything to convince me it will be different than the old government," 38-year-old protester Jan Filip told the Reuters news agency. "Almost all of the cases Kuciak covered could already have been investigated, yet none of them made it to court."

Despite Fico's resignation last month, Slovakia's new government under Peter Pellegrini retains several of the same figures from the previous administration.

President backs protesters' calls

Slovakia's left-leaning President Andrej Kiska, a liberal lawmaker at odds with the country's broad coalition led by left-wing nationalists, echoed calls from the street for Gaspar to step aside.

Kiska told Slovakia's TASR news agency that Gaspar's departure was crucial to "rebuilding people's trust in the police."

Read more: Murdered Slovak journalist's final report details links between Mafia, government

Kuciak's investigations, which were later published posthumously, reported on a deal between the Slovak government and the country's biggest privately owned security firm, whose owner is a relative of Gaspar.

Kuciak had also published a series of stories implicating former Interior Minister Robert Kalinak, who appointed Gaspar back in 2012. Kalinak resigned shortly after protesters had begun taking to the streets.

The police chief has denied any wrongdoing.

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dm/msh (AP, Reuters)

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