At least five security men were killed on Friday when militants opened fire at a checkpoint in Giza province in Egypt, an interior ministry source said.
The attacker has also since been arrested and is being questioned by police.
Two German women were killed in the attack, the Red Sea Security Directorate said, and the four others were wounded.
Regional media citing "security sources" claim to have identified the attacker as a 28-year-old graduate of the Faculty of Commerce at al-Azhar University, originally from the town of Qaleen in Kafr al-Sheikh - but officials have yet to publicly confirm the man's identity.
Hurghada, some 400 kilometers south of the capital Cairo, is one of Egypt's most popular vacation spots on the Red Sea.
Russian Federation said the crash was caused by a bomb, and banned flights to Russian Federation from Egyptian airports in response.
Egypt has struggled to quell the Islamic State Jihadist group based in the Sinai Peninsula and smaller militant groups in the mainland since the military overthrew Islamist president Mohammed Mursi in 2013 and cracked down on his supporters.
Two German tourists died of their wounds while four others were hurt, including citizens of Ukraine and the Czech Republic, the official said. "It is very early to know", told AFP an official of the ministry of the Interior.
According to witnesses, the attackers blasted the vehicle with automatic rifles, took equipment and threw petrol bombs inside the auto before fleeing.
On Saturday, tight security was in place at the site of the Hurghada attack.
The shadowy group Hasm, believed to be affiliated with the banned Muslim Brotherhood, has claimed responsibility for similar attacks.