U.S. students face more questioning in Egypt

The three U.S. students detained in Cairo face more questioning by Egyptian prosecutors after their arrest for allegedly throwing firebombs during anti-government protests.

Derrik Sweeney, a 19-year-old Georgetown University student, Luke Gates, a 21-year-old Indiana University student, and Gregory Porter, a 19-year-old Drexel University student, remain in custody though it is unclear if they have been formally charged.

An Egyptian official said the students were arrested on the roof of a university building where they were throwing firebombs at security forces fighting with protesters near Tahrir Square. The official spoke on condition of anonymity because there was no authorization to speak to the media.

Morgan Roth, spokeswoman for the American University in Cairo, said the three were questioned Tuesday by an Egyptian prosecutor with a U.S. Embassy official present.

A university official tells CBS News correspondent Elizabeth Palmer the three young men were questioned Tuesday by a general Public Prosecutor, but would face another round of interrogation Wednesday from the State Security Public Prosecutor.

Roth said the students have been held by Egyptian authorities since their arrest Monday but she did not know whether they had been formally charged. It wasn't unusual for American students to get "caught up" in Egyptian politics, she said.

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Sweeney's mother, Joy Sweeney, described him as a principled person who stands up for his beliefs. He attended previous protests but stopped after a demonstration where dozens were killed, she said. He had assured his family the violence wasn't near him and he was safe.

Still, Joy Sweeney said she wasn't surprised he went.

"He got caught up in the whole college-change-the-world mentality, and he believes in democracy strongly," she said.

But she also said her son was the family peacemaker when siblings fought and she couldn't see him acting violently.

"I don't believe that he would intentionally throw a bomb at anyone," she said. "I don't believe that."

Their parents said Sweeney and Gates had been in Cairo since August, studying Arabic along with other subjects.

Joy Sweeney said others attending previous demonstrations had praised her son's Arabic and appreciated that a "blond-hair, blue-eyed kid" was supporting their calls for democracy.

The wave of protests and violence across Egypt that began Saturday has left 29 dead and thrown the country's politics into chaos less than a week before landmark parliamentary elections were to begin. Tens of thousands of people filled Tahrir Square on Tuesday to intensify pressure on Egypt's military leaders to hand over power to a civilian government.

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Joy Sweeney and Gates' father, Bill Gates, they have been in contact officials from the U.S. Embassy but have little information so far about their sons.

"I don't think anybody really knows what to expect," Bill Gates said.

Assil Dayri, 17, of Geneva, Switzerland, an American University student who is friends with Derrik Sweeney and Luke Gates, said they left the school Monday evening to see what was going on Tahrir Square. By 3:30 a.m., he got a call that they were being taken away by people they didn't know and that they didn't know where they were going, he said. Then the phone cut off.

He said he's confident his friends were not throwing firebombs as Egyptian officials have said but neither know Arabic well enough to communicate with Egyptian police.

"I think it's a big misunderstanding," Dayri said by telephone.

He said he's heard claims authorities found a backpack containing explosives that belonged to Sweeney, but it wasn't his.

"He left without a backpack," Dayri said.