Cairo: A bomb placed under a nearby car exploded in the coastal city of Alexandria in Egypt as the city security chief's convoy passed by, killing two policemen and wounding four others, the Interior Ministry said.

Local media reports said General Mostafa al-Nimr survived the explosion on Saturday and he was seen on a local TV channel in good condition while inspecting the area of the blast shortly after it took place.

The Interior Ministry had earlier reported only one policeman killed in the blast which occurred in the vicinity of a police station in the city's central Roshdi district.

Health Ministry spokesman Khaled Megahed said two policemen were killed and four others wounded in thes explosion, adding that one civilian was also wounded.

No group has claimed responsibility for the attack.