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An Egyptian court sentenced 183 supporters of the outlawed Muslim Brotherhood to death on Monday on charges of killing police officers, part of a sustained crackdown by authorities on Islamists, Reuters reported.

The men were convicted of playing a role in the killings of 16 policemen in the town of Kardasa in August, 2013 during the upheaval that followed the army's ouster of Islamist president Mohamed Mursi. Thirty-four were sentenced in absentia.

Egypt has mounted one of the biggest crackdowns in its modern history on the Brotherhood since the political demise of Mursi, the country's first democratically-elected president.

Thousands of Brotherhood supporters have been arrested and put on mass trials in a campaign which human rights groups say shows the government is systematically repressing opponents.

President Abdel Fattah al-Sisi, who as army chief toppled Mursi, describes the Brotherhood as a major security threat.

The movement says it is committed to peaceful activism.

The death sentences followed one of the bloodiest attacks on Egyptian security forces in years. Islamic State's Egypt wing claimed responsibility for a series of coordinated operations that killed at least 27 people last week.

Sisi blamed the Brotherhood for the violence and told Egyptians in a televised address that the war against militancy will be a long, tough one.

Egyptian authorities make no distinction between the Brotherhood, Islamic State and al Qaeda, arguing that they have a shared ideology and are equally dangerous.