Lawmakers from Ukraine's ruling Party of Regions were left with no choice but to use force against opposition leaders during a protest in parliament on Thursday, party member Vladislav Zabarsky said.

"We asked and tried to convince them to unblock the speaking rostrum, but unfortunately we had to move them with force," Zabarsky said.

Deputies from the ruling Party of Regions attacked members of the Yulia Tymoshenko Bloc-Batskivshchyna alliance after the opposition party members staged a protest in the chamber.

Five members of parliament, including two with serious injuries, were hospitalized.

The Our Ukraine - People's Self-Defense Bloc opposition party condemned the Party of Regions for its involvement in the brawl.

Hospitalized opposition MP Vladimir Bondarenko said in a telephone interview with Channel Five television channel that besides him the other four MPs in a hospital are Mikhailo Volynets, Vasyl Kravchuk, Yuriy Gnatkevich and Yevheniy Suslov.

The incident, he said, was planned in advance with some 100 members of the ruling Party of Regions participating in the fight.

"It was a pre-planned action as everything happened in a moment of a flash," Bondarenko said.

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