An Egyptian security official says 14 policemen have been killed in a shootout with militants southwest Cairo.
Hasm is a group that has claimed several attacks around Cairo targeting judges and policemen since a year ago.
The officers were killed in exchange of fire with the terrorists in el-Wahat desert in Giza, the officials said.
The fighters also used explosive devices in the attack, the sources said, adding that 16 officers died in the shoot-out and the number was expected to rise.
However, a security source told Al-Ahram Arabic news website earlier on Friday that at least 14 policemen were killed in the incident, while eight others were injured. Cairo alleges that Hasm is a violent branch of the Muslim Brotherhood, but the brotherhood has denied being linked to Hasm.
According to security sources, the shootout took place when the forces were attempting to raid a terrorist hideout in the area.
The militant group staging the insurgency pledged allegiance to Islamic State in 2014.
The security sources said authorities were following a lead to a hideout deep in the desert thought to house eight suspected members of Hasm, a group that has claimed several attacks around the capital targeting judges and police since previous year.