Egyptians gather as police inspect the Imbaba courthouse after an early morning explosion damaged the building despite a massive security operation to protect polling stations and voters, in Cairo, Egypt, Tuesday, Jan. 14, 2014 (Photo: AP)
A policeman stands in front of a damaged building of a court complex after an explosion in Imbaba, north of Cairo January 14, 2014 (Photo: Reuters)
Plainclothes police and investigators surround a damaged building of a court complex after an explosion in Imbaba, north of Cairo January 14, 2014 (Photo: Reuters)
Egyptian police stand guard at the Imbaba courthouse after an early morning explosion damaged the building despite a massive security operation to protect polling stations and voters, in Cairo, Egypt, Tuesday, Jan. 14, 2014 (Photo: AP)
Egyptian police check the damage after an explosion at the Imbaba courthouse amid a massive security operation to protect polling stations, in Cairo, Egypt, Tuesday, Jan. 14, 2014 (Photo: AP)
Egyptian police guard the Imbaba courthouse after an explosion damaged the building despite a massive security operation to protect polling stations and voters, in Cairo, Egypt, Tuesday, Jan. 14, 2014 (Photo: AP)
Rubble is seen in front of a damaged building of a court complex after an explosion in Imbaba, north of Cairo January 14, 2014 (Photo: Reuters)
Rubble is seen in front of a damaged building of a court complex after an explosion in Imbaba, north of Cairo January 14, 2014 (Photo: Reuters)
Policemen stand guard in front of a damaged building of a court complex after an explosion in Imbaba, north of Cairo January 14, 2014 (Photo: Reuters)
A explosion damaged the North Giza Court early Tuesday (Photo: Fouad Mansour)
A explosion damaged the North Giza Court early Tuesday (Photo: Fouad Mansour)
Hundreds queue at a polling station in Imbaba located metres away from a court where a bomb exploded a few hours ago (Photo: Fouad Mansour)
A explosion damaged the North Giza Court, January 14, 2014 (Photo: Fouad Mansour)