An upcoming meeting of the International Atomic Energy Agency (IAEA) is expected to focus on a latest report on the Iranian nuclear issue, which struck a tougher tone than before.

The report, prepared by IAEA Director General Mohamed ElBaradei, was submitted last week to the United Nations Security Council and the IAEA Board of Governors, which will start a five-day meeting in Vienna Monday.

According to media reports in Vienna, the draft report expressed "serious concern" over Iran's nuclear program, saying Tehran was hiding information about alleged studies into making nuclear warheads as well as defying UN demands to suspend uranium enrichment activities.

International Atomic Energy Agency Mohamed ElBaradei makes a speech during a celebration ceremony at Vienna's UN headquarters April 25, 2008. (Xinhua/Reuters Photo)