The government of Tonga has declared a state of emergency, following riots in the capital, Nuku'alofa, that left eight people dead.

The violence broke out when the Pacific kingdom's parliament failed to vote on democratic reforms on Thursday. Small protests continued on Friday.

Protesters torched and looted buildings and shops and set cars on fire in the city's main business district.

Some 80% of the buildings in the area had been destroyed, officials said. Eight bodies were found in the debris.

The government later agreed to hold elections in 2008 in which a majority of lawmakers would be directly elected. Currently, nobles and appointees outnumber elected MPs.

The government has asked Australia and New Zealand to send in troops to help restore order.