BUDAPEST, Hungary (AP) — Hungarian Prime Minister Viktor Orbán 's main challenger on Saturday led tens of thousands of demonstrators through the streets of Budapest in a protest over alleged child abuse in state-run juvenile institutions, an issue that has already shaken Orbán's government following a scandal last year.

The demonstration, called by , came in response to videos published this week depicting employees of a juvenile correction facility in Budapest physically abusing children housed there. The former head of the facility, who is in police custody on suspicion of operating a prostitution ring among other crimes, has also been accused of subjecting minors to physical and sexual abuse.

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