CAIRO -?Egyptian police spokesman said Saturday that the police forces only used tear gas in the clashes erupted on Friday.

Hany Abdel Latif, the spokesman, denied in a televised statement that police officers fired live bullets at protesters, and blamed the Muslim Brotherhood (MB) for the deadly clashes in Cairo.

Police "used no more than tear gas" in the clashes, Latif said, adding the Islamist protesters started the violence.

At least 31 people were killed in overnight clashes between supporters and opponents of ousted Morsi, and between pro-Morsi protesters and police forces across Egypt, Latif added. ?

Earlier Saturday, however, the MB said in a statement posted on its official website that at least 120 people were killed and more 4,500 others wounded, most of them suffered gunshot wounds in confrontations between pro-Morsi protesters and security forces in the Naser street in Cairo.