The US President-elect Barack Obama has accused Iran of trying to develop nuclear weapons and lending support to terrorist organizations.

"Iran's development of a nuclear weapon I believe is unacceptable. We have to mount an international effort to prevent that from happening." Obama said at his first press conference since winning Tuesday's presidential election.

Obama also said, "Iran's support of terrorist organizations, I think, is something that has to cease."

He also pointed to a congratulatory message he received from President Ahmadinejad following his historic victory over Republican John McCain.

"I will be reviewing the letter from President Ahmadinejad and we will respond appropriately," he noted.

MGH/HAR