A hostage standoff on a bus in western Ukraine ended Tuesday after a bizarre demand from the captor was met when the country's president publicly recommended a 15-year-old animal rights documentary narrated by Joaquin Phoenix.

Just before the end of the 12-hour standoff in Lutsk, a city located some 250 miles west of Kyiv, President Volodymyr Zelenskiy posted a video clip to his Facebook page stating: "Everyone should watch the 2005 film Earthlings."

The post has since been deleted.

The 13 hostages were all released unharmed, authorities said. Initial reports had placed the number of captives at 20. During the prolonged standoff, the gunman threw a grenade from the bus and fired shots at police, they said.

The state security service SBU identified the hostage-taker as Maksym Kryvosh, 44, who had previously served time in prison for "extremist views."

Interior Minister Arsen Avakov described "an unstable man who painted his vision of the world and invented a revenge for it."

"He had his own vision of justice and the value of human life," the interior minister said.

According to Reuters, the gunman, in posts on social media, had threatened to bomb a crowded place and demanded that senior Ukrainian officials publish statements acknowledging that they were terrorists.

He eventually agreed to release his captives following a 15-minute telephone call with Zelenskiy, the president's deputy chief of staff, Kyrylo Tymoshenko, told reporters.

After the standoff ended, Zelenskiy hailed law enforcement officers for saving the hostages.

"Human life is the most important value," he said on Facebook. "Now families can finally hug their relatives who spent the entire day on the bus in anguish."

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