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Ukraine's Deputy Interior Minister Anton Gerashchenko has said a terrorist who hijacked a commuter bus in the town of Lutsk, western Ukraine, identified himself as Maksym Plokhoy.

The man is a convicted felon with a history of mental disorders, the official says. reported, citing a source in law enforcement, that the man has a history of mental disorders.

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"There's a book on the internet, authored by Maksym Plokhoy, titled 'Philosophy of the Criminal,' which describes the author's time in prison and his life views," Gerashchenko wrote on Facebook.

Read alsoHostage taker in Lutsk issues demands, threatens to set off bombs

"Here is a typical excerpt from the book: 'They have been correcting me for 15 years, but I have not become a better person, rather the opposite – I've become even more of who I am. Why? Because I cope with myself and therefore I can't be corrected by others. Because I don't sell myself with fear. You can kill me, but this won't fix anything. I am always who I am, because I can. I can, because there is only one thing that I can't do - that's to not be a Criminal... Being a criminal is about depth and only it's only the one who has it can't but be a criminal. The face of God is in the mirror...," the official wrote, citing the book.

At the same time, according to police, the terrorist has a history of mental disorders.

Police say the threat to hostages is real since the culprit does have a weapon on him, which he showed to law enforcers.