Thai army spokesman Colonel Sansern Kaewkamnert said the fighting broke out at 6:15 am (2315 GMT Friday) near the Preah Vihear temple on the border between Thailand's Si Sa Ket province and Cambodia's Preah Vihear province.
On Friday, a Thai villager was killed and 15 Thai soldiers wounded in an exchange of artillery and small arms fire near the temple.
A Cambodian soldier was also reported killed, and several homes were damaged on the Thai side.//DPA
Somyos said his June 24 for Democracy group would rally at the Democracy Monument from 7 pm to midnight.
The People's Alliance for Democracy will hold a mass rally at the Makkhawan Bridge that day. PAD leaders vowed to prolong their rally until their demands are met.
The PAD wants the government to cancel the 2000 memorandum of understanding on framework to settle border dispute; to withdraw as a member of the World Heritage Committee and to expel all Cambodians from Thailand.
By noon, many red-shirt protesters have already gathered at the Rajprasong Intersection.
The will rally there from 1 pm to 3 pm before marching to the Democracy Monument.