New top story from Time: Gunman Carrying Explosives Holds 10 People Hostage After Seizing Bus in Ukraine

(LUTSK, Ukraine) — An armed man seized a long-distance bus and took people in it hostage in northwestern Ukraine on Tuesday launching an hours-long standoff with police, Ukrainian authorities said.

About 10 people are currently being held hostage, Ukraine’s Security Service said in a Facebook statement. Police earlier had put the number at 20. It was unclear how many people had been on board to start with, and whether any escaped.

Police sealed off the center of Lutsk, a city 400 kilometers (250 miles) west of the capital Kyiv. The assailant is armed and carrying explosives, police said. They said he threw a hand grenade that failed to explode at officers and shot at them at least twice during the still-ongoing siege.

Ukrainian President Volodymyr Zelensky said negotiations with the man are currently underway. “We’re doing everything to free the hostages,” Zelensky told reporters.

The man called the police himself at 9:25 a.m. (0625 GMT) after taking control of the bus and introduced himself as Maksim Plokhoy, Deputy Interior Minister Anton Gerashchenko said on Facebook.

In a Telegram account reportedly belonging to him, Plokhoy apparently admitted to taking people on the bus hostage, said that “the state has always been and always is the first terrorist” and demanded that top Ukrainian officials release statements on their social media pages calling themselves terrorists.

According to Gerashchenko, police have identified the man as Maksim Krivosh, a 44-year-old Ukrainian born in Russia. Krivosh had allegedly been convicted twice on a wide range of charges — robbery, fraud, illegal arms handling — and spent a total of 10 years behind bars.

Interior Minister Arsen Avakov traveled to Lutsk to supervise operations.

Ukrainian media reported that gunshots were regularly heard at the scene. It wasn’t immediately clear whether anyone has been injured. According to reports, Krivosh tried to reach out to journalists through hostages and their phones, demanding that they spread the word about his demands and get more reporters to arrive to the scene.

Zelensky said earlier on Tuesday he is personally monitoring the situation.