in Sept 2009. Separate reports say it is near Qom, and not yet operational Arak: Heavy water plant

Key nuclear sites in detail The new facility is said to be underground at a mountain on the site of a former missile site belonging to the Iranian Revolutionary Guards, north-east of the holy city of Qom. Construction on the facility - believed by the US to be large enough to contain 3,000 centrifuges, not large enough for commercial work - started in earnest in mid-2006, diplomatic sources said. Iran's letter to the UN watchdog, the IAEA, on Monday informed it that "a new pilot fuel enrichment plant is under construction". Iran told the agency that no nuclear material had been introduced into the plant, and enrichment levels would only behigh enough to make nuclear fuel, not a bomb. In response, the IAEA has requested Iran to "provide specific information and access to the facility as soon as possible", an IAEA statement adds. The disclosure of the new plant comes one day after world leaders stressed the need for greater co-operation against nuclear proliferation and shortly before Iran is due to resume talks with international powers on the issue. Since taking office in January, Mr Obama has told Tehran than he is ready for direct talks on the nuclear issue, but has had no firm response from Iran. Earlier this month, Tehran agreed to "comprehensive" talks on a range of security issues - but made no mention of its own nuclear programme. The talks are due to be