Thailand's constitutional court has dissolved the governing People Power Party (PPP) saying there had been vote fraud during the last election.

The party's leaders, including Prime Minister Somchai Wongsawat, were also banned from politics for five years.

But, under the constitution most of its MPs can keep their seats under another party name, and should be able to form another government, correspondents say.

Earlier, an anti-government protester was killed at a Bangkok airport.

Local television reported that a grenade had been fired at Don Mueang airport, the capital's domestic hub, which has been occupied by the People's Alliance for Democracy (PAD) since last week.

The PAD accuses Mr Somchai's government of being corrupt and hostile to the much-revered monarchy, and demands they resign.

They also accuse him of being a proxy of his brother-in-law, exiled former Prime Minister Thaksin Shinawatra.