The Thai Army said on Monday it deployed fighter jets in response to Cambodian attacks that left one soldier killed and four wounded. Meanwhile, a Cambodian defense spokesperson said Thai soldiers on Monday opened fire on Cambodian armed forces for the second straight day, adding that Cambodia did not fire back.

According to Thai Army Spokesperson Winthai Suvaree, the incident occurred at around 07:00 a.m. local time in the Chong Bok area of Nam Yuen District, where Thai soldiers operating in the area were attacked with "supporting fire weapons," resulting in the five casualties.

The deadly engagement followed an earlier clash in the nearby Chong An Ma area at around 05:05 a.m. local time, when Cambodian troops opened fire with small firearms and indirect weapons, prompting the Thai side to respond under the rules of engagement, the Thai Army said in a statement.

In response to the casualties and what it termed a "direct threat to national security," the Royal Thai Air Force (RTAF) confirmed it has commenced air operations targeting Cambodian military infrastructure.

"These developments prompted the use of air power to deter and reduce Cambodia's military capabilities to the minimum level necessary to safeguard national security and protect civilians," said RTAF Spokesperson Jackkrit Thammavichai.

On the same day, Cambodian Defense Ministry's Undersecretary of State and Spokesperson Lt. Gen. Maly Socheata said around 05:04 a.m. on Monday, the Thai military forces launched an attack on the Cambodian forces in the An Ses area, Preah Vihear province.

"Subsequently, they continued firing multiple shots with tanks at Tamoan Thom temple, in the vicinity of Preah Vihear temple and the Chomka Chek area," she added.

"It should be noted that this attack occurred after the Thai forces engaged in numerous provocative actions for many days, especially the incident Sunday at the Prorlean Thmar area, with the objective of instigating confrontations," Socheata said, adding that Cambodia has refrained from retaliation during the two assaults and continues to monitor the situation with utmost caution, standing on the spirit of "respecting all previous agreements and resolving conflicts peacefully according to international law."

Additionally, Cambodia has informed the ASEAN Observer Team about this incident and plans to request an investigation into the matter, she said.