Thailand's military says it has deployed one F-16 fighter jet has been deployed for action against Cambodia, with another five being readied.

This comes after at least two Thai civilians were killed, and two others injured, by shelling from the Cambodian side of the border on Thursday.

It also follows a landmine incident yesterday in which five Thai soldiers were injured near the border.

Around 40,000 civilians from 86 villages in Thailand have been evacuated, the district chief of Kabcheing in Surin province, Sutthirot Charoenthanasak, told Reuters.

Meanwhile, the Cambodian Prime Minister Hun Manet has said Thailand attacked Cambodian army positions.

He added: "Cambodia has always maintained a position of peaceful resolution of problems...But in this case, we have no choice but to respond with armed force against armed aggression."

Phumtham Wechayachai, Thailand's acting Prime Minister, said that the situation on the border "remains delicate".

However, both Cambodia and Thailand have accused each other of starting the conflict.