Cairo (CNN) At least three Vietnamese tourists and an Egyptian tour guide were killed Friday when a roadside bomb struck a tourist bus in Egypt, Prosecutor-General Nabil Sadek announced Friday night , according to state-run Ahram Online.

The bombing took place in the Giza region near Cairo, where the pyramids are located.

At least 11 people were wounded, Sadek said. Authorities said earlier the wounded include 10 Vietnamese tourists and the Egyptian bus driver.

The incident occurred on El-Maryoutiya Street in Giza's Haram district, where an improvised explosive device was hidden near a wall. The bomb went off when the bus went by, authorities said.

Vietnam's Foreign Minister and Deputy Prime Minister, Pham Binh Minh said he was "deeply saddened" by Friday's attack.

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