Egyptian security forces have stepped up their crackdown against anti-government demonstrators in cities across the country, with at least 6 people killed since Thursday.

Security forces attacked supporters of the Muslim Brotherhood movement in the capital Cairo on Friday, leaving one person dead during demonstrations in Matariya neighborhood.

Meanwhile another protester died of injuries sustained during the Thursday rallies marking the one-year anniversary of the military's ouster of former president, Mohamed Morsi,

According to a security official, 157 people were arrested in the capital Cairo and eight other cities.

Egyptians have been staging massive demonstrations across the country to denounce the presidency of former army chief, Abdel Fattah el-Sisi, who ousted the democratically-elected president, Morsi, last year.

The violence comes after security forces killed four protesters in Alexandria and Giza on Wednesday.

Also in the city of Fayoum, clashes between police and demonstrators left at least three people dead.

Egypt has been the scene of anti-government protests with continuous clashes between security forces and Morsi’s supporters since his ouster.

Sisi is accused of leading the suppression of the Muslim Brotherhood supporters as hundreds of them have been killed in clashes with the Egyptian security forces over the past few months.

Rights groups say the army’s crackdown on the supporters of Morsi has left over 1,400 people dead and 22,000 others arrested.