Kenyan police have fired tear gas and water cannons to break up a peaceful protest calling for constitutional reform.

Several hundred protesters marched on the parliamentary building in the capital, Nairobi, Wednesday for the opening of a new session of the legislature. They chanted and held banners demanding a referendum on constitutional reform, before police intervened.

Kenya's government has said it will only put proposed constitutional reforms to a referendum after parliament has a chance to amend them.

In his opening speech to parliament Wednesday, President Mwai Kibaki said he is committed to the constitutional review process and urged members of parliament not to politicize the issue.

Some information for this report provided by AFP and AP.