The Muslim Brotherhood stole Egypt's January uprising that toppled former autocratic President Hosni Mubarak, U.S. Secretary of State John Kerry said in a statement on Wednesday.

"Those kids in Tahrir Square, they were not motivated by any religion or ideology. They were motivated by what they saw through this interconnected world, and they wanted a piece of the opportunity and a chance to get an education and have a job and have a future," Kerry said.

He described the Brotherhood as the "one single-most organized entity in the state that stole the revolution."

Kerry's statements are the fiercest against the Brotherhood since Egypt's military deposed President Mohamed Mursi, who hailed from it, which was prompted by mass protests against his rule.   

The U.S. and the European Union had expressed concern over Mursi's ouster and demanded a quick return to the path of democracy, yet they did not describe his ouster as a "coup".

The U.S. has suspended about $585 million (364 million pounds) of annual military aid to Egypt following Mursi's ouster.