Cambodian officials have reported another 12 people killed as a result of the ongoing border dispute with Thailand, with the death toll on both sides now standing at 32, as fears grow that the Southeast Asian neighbours may become engulfed in an extended conflict.

Cambodian Ministry of National Defence spokesperson Maly Socheata told reporters on Saturday that seven more civilians and five soldiers were confirmed dead. One other Cambodian man was earlier reported killed when Thai rockets hit the Buddhist pagoda he was hiding in on Thursday.

At least 50 Cambodian civilians and more than 20 soldiers have also been injured, the spokesperson said.

Thailand has reported 13 civilians – including children – as well as six soldiers killed over the past two days of fighting. An additional 29 Thai soldiers and 30 civilians have also been wounded in Cambodian attacks.

Cambodian newspaper The Khmer Times, quoting officials in Cambodia’s Preah Vihear province, said about 20,000 residents have so far been evacuated from the country’s northern border with Thailand.

More than 138,000 people have also been evacuated from Thailand’s border regions, with about 300 evacuation centres opened, according to Thai officials. On Friday, Thailand declared martial law in eight districts along the border with Cambodia.

The decades-old conflict – centred around a contested section of the Thai-Cambodian border – re-erupted on Thursday after a landmine explosion along the border wounded five Thai soldiers.