He said Egyptian officials contacted with the Vietnamese Embassy, and the Egyptian tourism minister would meet with the Vietnamese Ambassador in Cairo soon.
The PM emphasised medical assistance for the tourists as the most important thing to do.
The incident occurred when a bus carrying a group of Vietnamese tourists along with a guide and a driver of Egypt was hit by a roadside bomb at 18:15 (23:15 of December 28, Hanoi time).
The improvised explosive device was placed near a wall along the Mariyutiya Street in Al-Haram district near the Giza Pyramids.
According to the Vietnamese Embassy, there were 18 people on the bus at that time, including 15 Vietnamese and three Egyptians.
The Egyptian side confirmed an Egyptian was killed along with the three Vietnamese tourists in the bomb attack.
After the attack, all victims were rushed to El-Haram hospital in Giza province.
No militant group immediately claimed responsibility for the attack.
Armed security personnel quickly deployed to the site and cordoned off the area for inspection. - VNA