More than 50 Egyptian security forces have died during a clash with Islamist militants in the Western Desert.
In response to the latest bloodshed Egyptian security forces appeared to step up their operations in the area of the attack.
At least 55 policemen were killed in the exchange of fire with the militants during a raid on a hideout near Cairo, Egypt.
The officials said the death toll could increase.
He also called on officials to exert all possible efforts to capture the terrorist elements involved in the shootout.
The number of dead was expected to rise, the sources said.
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Mr Andrae told reporters there is no indication that an extremist, political or religious background factored into the attack. Police said they believe it was not a terror attack, they suspect instead that the assailant had psychological problems.
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Police on their way to a hideout used by the Hasm militant group reportedly came under attack with rocket-propelled grenades. The group has claimed attacks around Cairo targeting judges and police. This comes as Sisi has largely failed to deliver on his vow to root out terrorism from Egypt.
Hasm - described by Egyptian security forces as an armed wing of the Muslim Brotherhood, an accusation the group denies - are one of several groups which have launched attacks in recent years. However, the group did not claim any affiliation to the Muslim Brotherhood.
BBC reported that more than 50 police officers were killed during clashes, while local media said 35 citing security sources.
Hundreds of police and army personnel have been killed since then.
The country has been under a state of emergency since bombings and suicide attacks targeting minority Coptic Christians killed scores earlier this year.
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.