Police investigating a school shooting in Brazil in which eight people were killed say the two young gunmen had planned their attack long in advance.

The pair, aged 17 and 25, killed five pupils, a school administrator and a teacher near the city of São Paulo.

Earlier, they had shot dead the uncle of the 17 year old.

A state official said the 17-year-old gunman “had never shown any problems” at school, but his mother said he had been bullied.