A second Ukrainian policeman died from injuries after clashes in central Kiev that also saw more than 140 people hospitalised, the interior minister said Tuesday.

Advertising Read more

"Another member of the National Guard, Dmitry Slastikov, died from injuries after yesterday's grenade explosion," Interior Minister Arsen Avakov said on Twitter.

In the worst outburst of violence in Kiev since the new government took power in 2014, nationalist protesters clashed with police and National Guard troops outside Ukraine's parliament on Monday as lawmakers took up a measure to give greater powers to Russia-backed separatists in eastern Ukraine.

About 140 people were hospitalised, most of them law enforcement officers, the interior ministry said. One National Guard officer died on Monday, and a second died a day later, both as a result of injuries caused by the grenade, Avakov said.

Most of the 100 violent protesters were members of Svoboda, a nationalist party that holds only a handful of seats in parliament. Wielding truncheons, pipes and sticks with nails, they faced off against police carrying shields and truncheons.

About 30 protesters were detained, of whom 18 remained in custody on Tuesday, including the man suspected of throwing the grenade. Avakov said he was a Svoboda member who fought in the east in one of the volunteer battalions, which are loosely controlled by the government.

President Petro Poroshenko, on a hospital visit to see the injured officers, pledged to find the organizers of the clashes who were handing out sticks and weapons, like grenades.

The decentralization of power was a condition demanded by Russia for a truce signed in Belarus in February aimed at ending the fighting between Ukrainian government troops and Russia-backed separatists that has left more than 6,800 people dead since April 2014.

But Ukrainian nationalists strongly oppose the constitutional changes, saying they would threaten the country's sovereignty and independence.

Poroshenko and his supporters insist that the constitutional amendment would devolve powers to local communities in all of Ukraine, from east to west, while making sure that Ukraine stays a unitary state.

While Ukrainian nationalists think the amendment gives too much power to the regions including the east, Russia-backed rebels there say this is not enough.

Speaking to Russian news agencies in Donetsk, rebel leader Alexander Zakharchenko criticized Poroshenko for taking out a clause that could offer sovereignty to the east and make it a part of a loose confederation within Ukraine.

Now that 265 lawmakers have given it preliminary approval, the bill comes up for the final vote where Poroshenko will need to get at least 300 votes.

(FRANCE 24 with AP)

Daily newsletterReceive essential international news every morning Subscribe