Iran's Foreign Minister says Washington has sent a letter to Tehran regarding the Strait of Hormuz, but the US note does not indicate any serious change in its attitude.

Ali Akbar Salehi says despite the assassination of Iranian nuclear scientists Tehran is still ready to hold talks with the P5 plus 1 group of nations.

The Iranian minister was speaking after a special ceremony to commemorate nuclear scientist Mostafa Ahmadi Roshan who was assassinated in Tehran on January 11. That day an unknown motorcyclist attached a magnetic bomb to Ahmadi Roshan's car.

He was immediately killed and his companion, Reza Qashqaee died hours later in hospital. Ahmadi Roshan was the deputy director of marketing at Iran's Natanz nuclear facility.

Also speaking to Press TV, Iran's Police Chief said the investigators have found a number of clues which could lead to the arrest of those behind the terrorist attack.

Iran says despite Western allegations its nuclear program is peaceful, and the outstanding issues can be resolved through dialogue.

Tehran has also agreed to receive the International Atomic Energy Agency inspectors, who are reportedly scheduled to inspect Iranian nuclear facilities towards the end of January.