The two girls and one boy were last seen at the school about 12.15pm on Thursday.

The girls are aged 11 and nine years old; the boy is 10 years old.

Police said the three children were known to deliberately hide and believe they are still in the Tuggeranong area.

At the time, police said they were still concerned about their wellbeing considering the temperature will drop at sunset.

Police thanked Canberrans for their help.