US Secretary of State John Kerry has told Egypt's foreign minister that it is "important to listen to the Egyptian people", the State Department has said.
A State Department spokesperson said the US is "committed" to allowing the democratic process to take place in Egypt and denied reports that the US has been calling for early elections in the country, saying the reports are "inaccurate".
The Muslim Brotherhood tells ITV News they are against violence but will "pay the price of their blood" to restore their ousted president.
Egypt's army has named two further officials in the transitional government as its supporters and opponents vowed to stay on the streets.
There has been outrage in Egypt after 51 people were killed near an barracks where ousted President Mohamed Morsi is thought to be held.