A bomb killed two policemen on a train in the Nile Delta on Wednesday, the health ministry has said.
The bomb exploded in the last compartment of a train that had stopped at Menouf station in Menoufiya governorate.
The railway authority said the explosion took place when policemen were searching the train after passengers had reported a suspicious package.
Local health official Hanaa Sorour told state news agency MENA that nine people suffered minor injuries and one person was transferred to hospital.
Egypt has been hit by a wave of bomb attacks since the ouster of Islamist president Mohamed Morsi in July 2013.
Early on Thursday, a bomb exploded near the Qobba presidential palace in Cairo, injuring a woman.