Less than a year since elections restored democratic rule after a military coup in 2006, Thailand has plunged into fresh instability. The worst violence seen in Bangkok for 16 years leaves Samak Sundaravej, the Thai prime minister, with few options. Clashes between antigovernment protesters and supporters of the administration have left one dead and dozens injured. With air and rail services badly affected, tourism suffering and public sector unions threatening a national strike for today, the imposition of emergency rule in the capital yesterday was inevitable and justified.

The protests began a week ago when supporters of the People's Alliance for Democracy occupied and barricaded Government House. The PAD accuses Mr Samak's People Power Party of being a front for Thaksin Shinawatra, exiled former prime minister, and of buying votes in last December's election. It says it wants to clean up the electoral system.