The interior ministry has said 16 policemen were killed and 13 were injured in a shootout with terrorist in Egypt's Western Desert.
Al-Arabiya correspondent in Cairo reported on Friday that 16 security forces personnel were killed in clashes with militants in Giza, southwest Cairo. However, it did not clarify on the number of casualties on both sides.
In total, 53 members of the security service died, sources told the BBC.
There has not yet been a claim of responsibility.
No militant group immediately claimed involvement in Friday's shootout.
Combing operations continue in the deserted region as the security forces are trying to flush out the remaining insurgents.
Egypt is now battling an Islamist insurgency.
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But an AFP reporter did not see the strongman leader at an open-air ceremony involving foreign dignitaries, and his office said he had cancelled his participation in a number of other engagements. This comes as Sisi has largely failed to deliver on his vow to root out terrorism from Egypt. However, the group did not claim any affiliation to the Muslim Brotherhood.
A violent anti-government campaign in the Sinai Peninsula has grown since the military overthrew democratically elected President Mohamed Morsi of the Muslim Brotherhood in mid-2013.
Since then, an extensive crackdown on the group has left it in disarray with competing wings that have disagreed on whether to resort to violence, after police bloodily suppressed their protests.
Hasm is a group that has claimed several attacks around Cairo targeting judges and policemen since previous year.
The Ministry said that the police forces killed and injured 15 terrorists during the clashes.
Egypt has been under a state of emergency since bombings and suicide attacks targeting minority Coptic Christians killed scores earlier this year.