Cairo’s prosecutor general said late Wednesday that the three American students arrested in Egypt will be held for another four days while investigations continue. The three students, who are on an exchange program at the American University in Cairo, were arrested by Egyptian police Monday for allegedly throwing a Molotov cocktail during riots. The three young men reportedly called home on Wednesday, said Joy Sweeney, the mother of one of the students, 19-year-old Derrik Sweeney. Joy Sweeney said “it was so great to hear his voice,” and “he was definitely shaken up and as terrified as he looked” in the video shown on Egyptian state television of the men. U.S. State Department spokesman Mark Toner said U.S. officials are “in close contact” with the families of the students, and he believed that “no formal charges” have been filed yet.