Irish Diplomats still haven't managed to locate the four Irish siblings who were detained after security forces stormed a mosque in Cairo at the weekend.
The envoys visited Tora prison and several other facilities on the outskirts of the city, in an unsuccessful attempt to locate the three sisters who are in their twenties, and their teenage brother.
A Turkish diplomat is reported to have met the four Irish citizens on Sunday.
The four are children of Hussein Halawa, the Imam at Ireland's largest mosque in Dublin.
Meanwhile EU foreign ministers will meet to discuss their response to the escalating crisis in Egypt tomorrow.