Unidentified saboteurs put burning tyres on 20 security cameras at 12 spots across Narathiwat in the deep South yesterday morning.
The sabotage was reported at about 4am.
Thailand's southernmost region has been struggling with insurgency-related violence for nearly a decade.
Despite the ongoing talks, violent incidents continue to take place on a daily basis.
Nearly 100 people including teachers and children expressed their grief when they showed up at Pattani Airport to bid farewell to the dead soldiers, whose base was close to a school.
The bodies of the soldiers were airlifted from Pattani to their home provinces.
In a related development, the Southern Border Provinces Administration Centre and the Yala Buddhism Association have held a seminar to promote harmony in the southern border provinces.
Up to 220 religious leaders and community leaders in the provinces were present.
At the seminar, the participants expressed concern about signs that the violence would neither stop nor ease during the upcoming Ramadan.
The latest round of meetings between BRN representatives and Thai authorities had agreed in principle that the violence would halt during Ramadan.
However, BRN representatives later submitted several demands and a tight deadline in a way officials said made it unlikely for the government would agree.
Religious leaders in the South yesterday urged insurgents to refrain from any action against religious principles during Ramadan, and called on agencies to step up security measures.