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Police broke up the rally on Friday because President Mwai Kibaki, who has supported the proposed constitution ahead of a referendum on Nov. 21, was visiting the port city at the time, said Mutula Kilonzo, chairman of the main group opposing the document.

Following the violence, four men died — two who were brought dead to the hospital Friday, a third who died of his wounds overnight, and a fourth man who died Saturday, said Khadija Shikely, head of Coast General Hospital.

The referendum, Kenya's first since gaining independence from Britain in 1963, has seen Kibaki's Cabinet split, with members crisscrossing the country campaigning for opposing sides and sometimes being attacked with stones.

Dozens of people have been arrested as a result of the violence, including two lawmakers.

Rioting by opponents of the draft constitution left three people dead Oct. 30.

Kenya's current constitution was drafted in the lead-up to independence and has been revised several times to create a strong unitary state with sweeping presidential powers.

Opponents of the draft constitution say it would dilute changes proposed last year during a constitutional conference, including many checks on existing presidential powers and a powerful prime ministerial post.