Cairo (AP) - Egypt has classified the ghost ride of a stranger through downtown Cairo with at least 20 dead and 47 injured as an act of terrorism. In the car of the wrong-hand driver explosives had been discovered, said the Ministry of Interior after an investigation of the vehicle. According to preliminary investigations, the Islamist terrorist group Hasm is responsible for the attack, it was said. The country's authorities consider the group an armed wing of the Islamist Muslim Brotherhood, which is banned in Egypt and classified as a terrorist organization.