An Egyptian security official says a bomb went off near a police station and mosque in the southern city of Aswan, killing two civilians and wounding a soldier and four others.

He said the crude bomb went off near an electrical transformer on a road that runs along the River Nile, severing the foot of the soldier, who was a conscript.

Last week, a series of blasts went off in Cairo, killing one person and wounding at least seven others in another series of attacks using homemade explosives that authorities blame on Islamist militants.

The government is ramping up security ahead of a planned investment conference this month it hopes will draw billions of dollars from abroad.

The official spoke anonymously as he wasn't authorized to release the information otherwise.