Egyptian Prime Minister Mostafa Madbouly said that "the state will strike with an iron first anyone harming national security" on Friday evening in response to the deaths of three Vietnamese tourists and their Egyptian tour guide.The four were killed when a bomb exploded near their bus, injuring 11 people, four km [2.5 miles] near the Giza pyramids.
The last deadly attack on foreign tourists in Egypt was in July 2017, when two Germans were stabbed to death in the Red Sea resort of Hurghada.