A third member of Ukraine's national guard has died from injuries after Monday, August 31's violent protests outside the parliament in Kiev, officials say, according to BBC News.

The clashes - involving nationalists - erupted after MPs gave initial backing to reforms granting more autonomy to rebel-held eastern Ukraine.

The first death was reported after a grenade was thrown by a protester.

A ceasefire agreed between Ukrainian government troops and the pro-Russian rebels is reported to be holding.

Violence had escalated in the eastern regions of Donetsk and Luhansk in recent weeks, but the two sides agreed last week that from September 1 all violations of a February truce would cease.

A day after the clashes in Kiev, the government said it was boosting security in the capital, deploying 2,000 police and national guards on the streets and an armoured vehicle on four key routes in the city centre.

About 140 people were injured in Monday's violence, more than half of them national guardsmen.

The protest was organised by the populist Radical Party and ultra-nationalist Svoboda (Freedom) party - who oppose any concession to the rebels.

Police have detained about 30 people suspected of involvement, including a Svoboda member who confessed to throwing a grenade.