In this Monday, April 1, 2013 photo, hundreds of al-Azhar university students angered by a mass outbreak of food poisoning at the university hold signs and chant slogans as an ambulance carrying a poisoned student passes through the crowd in Cairo, Egypt. (AP Photo/Mostafa Darwish)

Photo by: Mostafa Darwish

In this Monday, April 1, 2013 photo, hundreds of al-Azhar university students angered by a mass outbreak of food poisoning at the university hold signs and chant slogans as an ambulance carrying a poisoned student passes through the crowd in Cairo, Egypt. (AP Photo/Mostafa Darwish)