Iran announced Wednesday that it had begun to install a new generation of uranium enrichment centrifuges to produce nuclear fuel at its Natanz facility. The announcement coincided with Wednesday’s talks between Iran and senior UN nuclear inspectors seeking to expand probes into suspected weapons-related tests. It also could add pressure to planned negotiations later this month between Iran and world powers in Kazakhstan. The official IRNA news agency quoted Iranian nuclear chief Fereidoun Abbasi as saying that Iran began installing the new, more advanced centrifuges at the Natanz site in central Iran about a month ago. He said they would...