A Thai protester has been killed and four people wounded in a shooting at an anti-government march in the capital Bangkok, medical officials have said.
The Associated Press news agency reported on Tuesday that gunmen fired on a convoy of anti-government protesters.
Paradorn Pattanatabut, a security advisor to the Prime Minister Yingluck Shinawatra said that initial intelligence suggested that the shooting was politically motivated.
The assailants fired unseen at a bus and a truck carrying demonstrators to their encampment in central Bangkok after they had protested at government offices north of the city.
A protest guard, Nasser Yeemah, said two women on a bus and two guards on a sound truck were wounded by the gunshots.
The Erawan Medical Centre, which monitors hospitals, said a 52-year-old man had died and four others were wounded in the incident.
It brought the death toll to 24, with scores wounded, since protesters took to the streets in November, in a bid to force Prime Minister Yingluck Shinawatra from office.
The protesters want Yingluck to resign to make way for an interim government to initiate anti-corruption reforms.