Two people were killed and two others injured when an explosive charge went off near a police station in Egypt's coastal city of Alexandria in the early hours of Tuesday, a security source said.
"The bombing took place only a few meters from Al-Raml police station in Abu Suleiman district, killing two people and injuring two others, one of which had his leg cut off," the source added.
No group has yet claimed responsibility for the bombing.
On Sunday, about 25 people were killed in anti-government demonstrations on the anniversary of the 2011 uprising that ousted veteran autocrat Hosni Mubarak.
Activists accuse President Abdel Fattah al-Sisi of returning Egypt to authoritarian rule since the army removed the Muslim Brotherhood from power in 2013 and then mounted the biggest crackdown against Islamists in the country's history.
Sisi says he is committed to democracy in Egypt, a strategic U.S. ally with influence across the Arab world.
Islamist militants have killed hundreds of police and soldiers since then-army chief Sisi overthrew president Mohamed Mursi of the Muslim Brotherhood in 2013.
A law enacted during Sisi's rule severely restricted demonstrations, dramatically reducing unrest in Egypt.
However, signs of discontent emerged in the run-up to the anniversary of the 2011 uprising that raised hopes of greater freedoms in the most populous Arab country.
