Video footage shows punches being exchanged amid raucous shouting.

A huge object, apparently the parliamentary mace, is hurled from one side of the chamber to the other - and then back.

A journalist said security then threw out some MPs.

https://twitter.com/omegabritishbah/status/1595403775157624832?s=20&t=AMp5NT2s1w3-2LjYqk75_Q

Members from the governing and opposition parties were pitted against each other over a plan to bring in proportional representation for next year's local and general elections.

The proposals from the electoral commission require parliamentary approval.