'Serious Concerns' For Girls Who Went Missing After School

UPDATE: The two missing girls have been found safe and well.

Police confirmed the pair were found in Penrith in Sydney's west, shortly before 4am on Saturday following an extensive search.

"Their families have been informed and officers will be speaking with them shortly," police said.

Earlier police said there were serious concerns for the two 11-year-old girls who were reported missing in north-west Sydney.

Hayley and Nida were last seen leaving a primary school in Cherrybrook about 3pm on Friday but had not been heard from since.

They may have pre-arranged to travel to the city on public transport, police said.

Hayley. Image: NSW Police

But at about 4.30pm, police were notified that they were missing.

The girls are believed to have changed out of their school uniforms and it is not known what they were wearing.

Hayley was desrcibed as being of Caucasian appearance, 150-160 centimetres tall and with long blonde hair.

Nida was described as being of Indian Sub-Continental with olive complexion, 150 centimetres tall and with long black hair.

Nida. Image: NSW Police

"Serious concerns are held for their welfare due to their young age," NSW Police said.

Ryde Police Area Command extended their inquiries after a search of the local area failed to locate the girls.