Three brothers have gone missing from their foster home in Sunderland.
They went out for a bike ride on Monday, but did not return. Police say Remus, Janko and David Matlock are Polish, but speak good English.
More top news
Scientists have unveiled high-tech plans to preserve ancient sites in the Middle East at risk of destruction by the so-called Islamic State.
More is needed to help overcome poverty and inequality in New Orleans, 10 years after Hurricane Katrina devastated the area, Obama has said.
WARNING: Some people may find images upsetting.