New Kenyan constitution signed

Celebrations have been taking place in Kenya as a new constitution, aimed at giving more power to the people, is signed into law.

President Mwai Kibaki put his signature to a document that has been described as the most important in the country's history since independence half a century ago.

The constitution contains some radical reforms, largely in response to the violence that followed the general election of late 2007 when more than 1,000 people were killed.

Peter Greste reports.