Leftist activist Alaa Abdel-Fattah has been summoned by the prosecution to answer questions about his alleged involvement in the torching of presidential candidate Ahmed Shafiq's campaign headquarters, according to Al-Ahram's Arabic-language news website.
The arson attack took place after the Supreme Presidential Electoral Commission announced Monday that Mubarak-era premier Ahmed Shafiq and Muslim Brotherhood candidate Mohamed Morsi had qualified for the presidential election runoff on 16-17 June.
Four suspects detained at the scene have claimed they saw Abdel-Fattah in the area when the arson attack took place.
However, Abdel-Fattah has denied receiving an official document summoning him for questioning. He was previously detained by the military prosecution for allegedly participating in the Maspero clashes in October 2011, when mostly Christian protesters clashed with the military leaving scores dead. He was eventually acquitted.