Brussels: Electronic identity cards for all children under 12 are to be introduced in Belgium. They will bear a code designed to allow parents of missing children to be traced instantly.

The announcement came as Belgian police continued to search for two young girls who vanished from the street outside a bar in the middle of the night a fortnight ago.

Though the ID cards would be useless in protecting children from an abductor or adult determined to do them harm, they are intended to offer a secure way of making sure a lost child can be reunited with family.

Belgians have been greatly sensitive to issues of missing children since the case a decade ago of Marc Dutroux, a paedophile rapist and killer who kidnapped six children, killing four of them, before being caught.

The new children's cards will carry a special code number and instructions on how to call a central missing child hotline.