A bomb exploded in Cairo Tuesday just before polling stations opened for the national vote on a new constitution.
No one was hurt, but at least eleven people were killed in other incidents connected to the referendum, despite tightened security for the vote.
At least five deaths resulted from clashes between security forces and supporters of former president Mohamed Morsi, who was ousted by the military last year.
The military-backed interim government wants the new charter to replace the constitution passed while Morsi was in power.
It hopes to win strong backing in order to validate its removal of the country's first democratically-elected president.
So, how would life in Egypt change under the new constitution?
Under the new charter, equality between men and women and freedom of belief will be guaranteed, parties will not be permitted to be formed on the basis of religion, race, gender, or geography, and the president can be impeached by parliament.
"I came out because this constitution is the best constitution we have had and was done by professionals. First of all it respects human rights and freedom of religion. It's a civil constitution for a civil advanced state and this is what we were wishing for."
Morsi supporters are boycotting the vote.
"We can never participate and give legitimacy to a regime which fools the people and tries to act like it is a civil democratic regime. It is neither democratic nor civil."
The referendum is expected to receive mostly 'Yes' votes, but analysts say the turnout is important too.
Less than 33 percent of the population voted for last year's charter.
This vote is the third in three years and nearly 53 million people are eligible to cast their ballot.
A positive result could also pave the way for fresh presidential elections.
The chief of Egypt's army, General Abdel Fattah al-Sisi, who led the ouster of Morsi, has emerged as a strong candidate.
Kwon Soa, Arirang News.