CAIRO (AP) — A car bomb exploded early Saturday outside the Italian Consulate in Cairo, destroying several floors of the historic building in a powerful blast that killed one Egyptian, the latest casualty in an ongoing Islamic militant campaign targeting the country’s security forces.

No group immediately claimed responsibility for the blast, though Egypt faces threats from insurgent factions including an Islamic State affiliate in its restive Sinai Peninsula that the military says killed at least 17 soldiers in a recent assault there. Security service officials who spoke to The Associated Press said that attack killed dozens more.

The Italian Consulate bombing struck at around 6:30 a.m. (0430 GMT, 12:30 a.m. EDT), exploding in a side street in downtown Cairo near the building’s back entrance and a busy highway overpass. Italian authorities said the consulate was closed at the time and none of its workers were wounded.