Voters fill in their ballots during the second day of the referendum on draft constitutional amendments, at a polling station in Cairo, Egypt April 21, 2019.

An army soldier stands guard at a polling station, during the referendum on draft constitutional amendments, in Cairo, Egypt April 20, 2019.

People react on a bus outside a polling station, during the referendum on draft constitutional amendments, in Cairo, Egypt April 20, 2019.

People wait outside a polling station, during the referendum on draft constitutional amendments, in Cairo, Egypt April 20, 2019.

An army soldier stands guard outside a polling station, during the referendum on draft constitutional amendments, in Cairo, Egypt April 20, 2019.

A man has his finger stained with ink during the second day of the referendum on draft constitutional amendments, at a polling station in Cairo, Egypt April 21, 2019.

An Egyptian soldier stands guard as a man waits to cast his vote during the second day of the referendum on draft constitutional amendments, outside a polling station in Cairo, Egypt April 21, 2019.

An army soldier assists a woman at a polling station during the referendum on draft constitutional amendments, in Cairo, Egypt April 20, 2019.

Ink bottles are seen in a polling station during the second day of the referendum on draft constitutional amendments, in Cairo, Egypt April 21, 2019.

A man casts his vote during the second day of the referendum on draft constitutional amendments, at a polling station in Cairo, Egypt April 21, 2019. REUTERS/Amr Abdallah Dalsh - RC1B15286360

An Egyptian soldier stands guard as people wait in line to cast their votes during the second day of the referendum on draft constitutional amendments, at a polling station in Cairo, Egypt April 21, 2019.

A soldier stands guard outside a polling station during ballots counting on the final day of the referendum on draft constitutional amendments, in Cairo, Egypt April 22, 2019.

People wave flags outside a polling station during the referendum on draft constitutional amendments, in Cairo, Egypt April 20, 2019.

A man shows his ink-stained finger at a polling station, during the referendum on draft constitutional amendments, in Cairo, Egypt April 20, 2019.

People celebrate during the second day of the referendum on draft constitutional amendments, outside a polling station in Cairo, Egypt April 21, 2019.

People wait to cast their votes during the second day of the referendum on draft constitutional amendments, at a polling station in Cairo, Egypt April 21, 2019.

An Egyptian police officer stands guard outside a polling station during ballots counting on the final day of the referendum on draft constitutional amendments, in Cairo, Egypt April 22, 2019.

People wait to cast their votes during the second day of the referendum on draft constitutional amendments, at a polling station in Cairo, Egypt April 21, 2019.

People wave flags outside a polling station during the referendum on draft constitutional amendments, in Cairo, Egypt April 20, 2019.

People stand in line to cast their vote during the referendum on draft constitutional amendments, at a polling station in Cairo, Egypt April 20, 2019. REUTERS/Mohamed Abd El Ghany TPX IMAGES OF THE DAY - RC1D185B86E0

A man casts his vote during the referendum on draft constitutional amendments, at a polling station in Cairo, Egypt April 20, 2019.

People wait in line to cast their votes during the second day of the referendum on draft constitutional amendments, at a polling station in Cairo, Egypt April 21, 2019. REUTERS/Amr Abdallah Dalsh - RC17BFB476C0

A ballot box is seen in a polling station during the second day of the referendum on draft constitutional amendments, in Cairo, Egypt April 21, 2019.REUTERS/Amr Abdallah Dalsh