Egypt has executed a convict for a murder committed during riots in mid-2013, the first death sentence carried out against a supporter of the banned Muslim Brotherhood under President Abdel Fattah el-Sisi, according to the Interior Ministry.
In a statement on its Facebook page on Saturday, the ministry said that Mahmoud Hassan Ramadan Abdel-Nabi had been hanged for an incident where children were thrown from a building during protests in 2013 against the overthrow of President Mohamed Morsi.
Security sources have described Ramadan as a "radical Islamist" who is not officially a Brotherhood member.
Former army chief Sisi oversaw the army's removal of the Brotherhood's Morsi, elected president following the 2011 uprising, in July 2013 following mass protests against his rule.
He has since implemented a harsh crackdown on Islamists as well as secular political opponents.
Egyptian courts have sentenced hundreds of alleged Brotherhood supporters to death in recent months, many in mass trials condemned by foreign governments and rights groups as violating international law.
Saturday's execution came a month after Egypt's high court upheld the death sentence against Ramadan. Most of the other death sentences are still under review in a complex system of legal appeals.
In one of the most dramatic scenes of the upheaval following Morsi's fall captured on video, Ramadan threw someone off a rooftop during clashes in Alexandria's Sidi Gaber district. An al-Qaeda flag was seen tucked into the back of Ramadan's trousers.
Fifty-seven others were sentenced to 15-25 years in the case.
The Brotherhood, which says it is committed to peaceful activism, has accused the military of staging a coup and curbing freedoms won in the 2011 uprising that toppled Hosni Mubarak.