PERU plans to sue Yale University to recover thousands of artefacts excavated from Machu Picchu more than 90 years ago. The South American country is seeking the return of some 4,900 artefacts from the Inca citadel, including ceramics, cloths and metalwork. Peru says they were lent to Yale for 18 months in 1916 but that the university in New Haven, Connecticut, has held on to them ever since. "Yale does not recognise the Peruvian state's ownership of these artefacts," Peru's ambassador to Washington, Eduardo Ferrero, said in a statement. He complained that after three years of talks, Yale officials were...