Anti-government protesters have forced the closure of Thailand's main international airport as a second day of demonstrations in Bangkok descended into violence with 11 injured in clashes.
Thousands of supporters of the People's Alliance for Democracy breached police lines and stormed Suvarnabhumi Airport in their effort to pressure the premier to resign.
Flights into Suvarnabhumi will be diverted to the northern city of Chiang Mai or the southern island of Phuket, a spokeswoman said.
Hours earlier, a clash erupted on a road to the Don Muang domestic air terminal where thousands of activists behind a six-month campaign to topple the government have besieged the makeshift base of prime minister Somchai Wongsawat.
11 people who sustained injuries in the incident were being treated in hospital.
One of the injured is in a critical condition, having been shot in the chest.
Television footage showed two men wearing yellow armbands over camouflage jackets firing pistols.
Opposing groups, including some wearing red shirts of the pro-government camp, hurled stones at each other beneath a Bangkok flyover.
PAD protesters drape themselves in yellow shirts and headbands to symbolise their loyalty to Thailand's revered monarchy.
The airport closure and clashes came a day after protests by the PAD, a loose coalition comprised largely of royalists, Bangkok's old elite and the middle class, forced the cancellation of a parliamentary joint sitting.
The alliance has said it is in a 'final battle' against the government elected in December, which it accuses of being a corrupt puppet of exiled former premier Thaksin Shinawatra, who was ousted in a coup.
Riot police have largely refused to tackle protesters amid fears of a repeat of clashes between protesters and police on 7 October that left two people dead and 500 injured.
A union chief said protestors might picket Suvarnabhumi airport early tomorrow, when the prime minister returns from the Asia-Pacific summit in Peru.
