Religious ceremonies for all of the victims of the mass slayings in Nong Bua Lam Phu got under way on Saturday with sponsorship from His Majesty the King.

Forest runoff flooded commercial areas and communities in Mae Sai district of Chiang Rai overnight due to heavy rain along the Thailand-Myanmar border in a second bout of flooding in the border district since August.

Ten people were hurt, seven seriously, when a tour van plunged about 30 metres into a ravine in Long district of Phrae province early Saturday morning.

His Majesty the King has told bereaved families he "shares their grief" following a nursery massacre that killed dozens in Nong Bua Lamphu.

Two police officers in southern Vietnam have been arrested for negligence over a karaoke bar fire that killed 32 people last month, authorities said.

As the country reels from one of its worst mass killings, those on the frontline of family violence, drug addiction and mental illness in a country awash with guns say support systems are in crisis and need a shake-up to prevent further tragedies.

Local airlines are banking on borders reopening in Asian countries, but are cautiously planning their routes as a weak currency and high fuel costs still afflict the industry.

A national water management meeting chaired by Deputy Prime Minister Prawit Wongsuwon on Friday approved a Bangkok Metropolitan Administration (BMA) plan to improve drainage efficiency on the eastern side of the Chao Phraya River to prevent flooding.

The newly appointed Royal Thai Air Force commander says he is not sure whether the United States will agree to sell F-35 fighter jets to the RTAF.

The Pheu Thai Party has pledged to revive the "war on drugs" following the massacre at a child development centre in the northeastern province of Nong Bua Lam Phu.