U.S. President Barack Obama warned the transfer of some powers by Egypt's President Hosni Mubarak did not represent credible, concrete change and said Cairo must spell out a clear path to democracy.

"The Egyptian people have been told that there was a transition of authority, but it is not yet clear that this transition is immediate, meaningful or sufficient," Obama said in a written statement.

"Too many Egyptians remain unconvinced that the government is serious about a genuine transition to democracy, and it is the responsibility of the government to speak clearly to the Egyptian people and the world. The Egyptian government must put forward a credible, concrete and unequivocal path toward genuine democracy, and they have not yet seized that opportunity," he said, AFP reported.