The upcoming report by the International Atomic Energy Agency will make the most detailed charges to date that Iran's nuclear program is geared toward weapons development and military use, several Western diplomats briefed on the report told CNN. The diplomats said that the report, expected to be released by the U.N. nuclear watchdog next week, will include more data than the organization has previously released on clandestine efforts by Iran to develop technologies to build a nuclear weapon, including computer models of a nuclear warhead. They argue the IAEA studies offer no other explanation for those efforts beyond Iran seeking to develop a nuclear weapon. Although previous IAEA reports have cited concerns by the organization that Iran has been seeking to develop nuclear warheads and ballistic missiles to deliver them, the diplomats said the upcoming report is expected to make the charges more explicitly.