Ugandan authorities say the death toll from a Tuesday lightning strike at a primary school has risen to at least 20.

Officials say two more students have died as a result of the lightning strike at the Runyanya Primary School in the Kiryandongo district .

A teacher is among the dead.

Authorities say 36 other people were injured.

The state run New Vision newspaper says a separate lightning strike injured 37 children and two teachers at a primary school in the country's northern district of Zombo on Tuesday.

The paper says that lightning strikes have killed more than 40 people in Uganda in recent weeks. Experts say a lack of lightning rods on many Ugandan buildings may be partly to blame for the high number of casualties in the country.