A fourth person has died following deadly riots in Kenya on Saturday during a rally for a proposed new constitution.

Dozens were injured - some suffering gunshot wounds - when supporters clashed with opponents of the new charter in the western town of Kisumu.

Kenya: Four Die, Dozens Injured During Pro-Constitution Rally

Police are being criticized for opening fire at the rally. But commissioner Hussein Ali defended the use of live ammunition, saying police acted appropriately to contain a situation that could have spiraled out of control.

Kenya: Four Die, Dozens Injured During Pro-Constitution Rally

At least 46 people were arrested during the riot and are due to be charged in court Monday.

Kenya: Four Die, Dozens Injured During Pro-Constitution Rally

Violence has marred several rallies during the run-up to the referendum on the constitution, set for November 21, which has caused deep divisions within the government.

Critics say the new Kenyan constitution fails to create a strong prime ministerial post, designed in an earlier version to curb the president's sweeping powers.