BANGKOK - THAI police said on Wednesday they had found a man's body wrapped in plastic at Bangkok's domestic airport, a week after anti-government demonstrators lifted a blockade of the facility.

The man, aged about 30, was dressed in the uniform worn by volunteer guards of the People's Alliance for Democracy (PAD), which occupied Don Mueang airport between Nov 26 and Dec 3, they said.

The corpse was wrapped in plastic bags and dumped on the second floor of an abandoned cargo building on Tuesday evening, police Lieutenant Colonel Boonchot Lengbamrung said.

'The body is decayed, but from a primary investigation he was attacked and died around five or six days ago,' he told AFP, without elaborating on the nature of the attack.

Police were working to identify the body, he said.

The man carried a piece of cloth that the guards - known as the 'Srivijaya Warriors' - often used as a good luck charm to ward off danger, Col Boonchot said.

The area where he was found was occupied by PAD guards during the seizure of the airport, he added.

At least one PAD supporter was previously reported killed and 22 wounded in a grenade attack at Don Mueang on Tuesday last week, hours before a court ruling ousted the prime minister and led to the movement lifting the siege.

Thousands of protesters took control of Don Mueang and the newer Suvarnabhumi international airport, leaving thousands of tourists stranded and causing Thailand to lose nearly four billion dollars in revenue.

Guards from the royalist PAD have been accused of threatening behaviour during the PAD's occupation of the prime minister's offices in Bangkok from late August until last week and during the siege of the two airports.

A court disbanded Thailand's ruling People Power Party (PPP) and barred prime minister Somchai Wongsawat from politics for five years on December 2 following months of PAD protests.

The main opposition Democrat Party is now seeking to form a government with the PPP's former coalition partners. -- AFP