The firing killed 9 adults and 2 unknown children.

It's this part here, about unknown children and such.

The unknown children's writer from Devon has taken the world by storm.

It became socially acceptable to admit to caring for an unknown child.

The picture of the unknown child stayed in the attic.

The couple had three sons, one daughter and one unknown child who died young.

Therefore there must be an unknown second child (at this time - 1651).

He owns a Monet, along with bizarre portraits of unknown children.

They had had scarcely more contact with her than some unknown child born the same day at the far end of the world.

We worried about the health of an unknown child.