Authorities were clearing the wreckage of a collapsed school roof that killed five schoolchildren in Thailand.

Footage shows workers collecting crumpled iron sheets and broken metal beams on May 23 after a fierce storm pummeled the Wat Nern Por school on Monday, killing seven - including five children aged between six and 13 - and injuring 18 others.

Phichit Governor Payon Asavapichayon said the bereaved families will receive 29,700 THB (860 USD) in cash assistance, which would be doubled if the deceased was a breadwinner. Generous donors also alloted an additional 10,000 THB (290 USD) for each of the families.

Meanwhile, the injured will receive 2,300 THB (67 USD), or 4,000 THB (115 USD) if they were hospitalised for more than three days.

Payon said: 'Post-mortem examinations are being conducted before the relatives can collect the bodies of their loved ones later in the evening.

'The school sports hall was constructed using donated funds. Its design may have been based on traditional knowledge. The Phichit Provincial Public Works and Town and Country Planning Office will conduct an inspection of the construction design.'

The local government has set up a response centre for residents affected by the storm, with more than 300 incidents of property damage reported.

Residents said the strong winds had damaged roofs some of their homes, while Buddhist monks had to evacuate the Wat Nern Por temple due to significant damage.

Homeowners whose houses were damaged are eligible for a housing restoration budget of up to a maximum of 49,500 THB (1,430 USD), Governor Payon said.

Officials said Good Samaritans have donated bottled water and rice to affected communities who were waiting for repairs to their homes.

Prime Minister Prayut Chan-o-cha has scheduled a visit to Phichit to personally assess the situation, offer condolences to the victims, and provide guidance on assistance measures.

Thailand and neighbouring countries in Southeast Asia are approaching their annual monsoon rainy season which sees soaring temperatures followed by powerful rain storms in the afternoon leading to widespread flash floods.