ALGIERS, Algeria—Authorities have detained 36 people in the brutal mob killing and burning of a man in a town in Algeria’s Kabyle region that the crowd suspected of starting dozens of wildfires but who had actually come to help, the head of the judicial police said Sunday. The fires that began last Monday tore through the mountainous region, killing at least 47 residents and 28 soldiers while destroying olive groves and livestock. Most fires across other regions were being checked and “no longer represent a danger for residents,” Civil Protection official Col. Farouk Achour was quoted by the official APS news agency as saying. More than 74 fires were put out in the last 24 hours, he said. But the brutality of the killing Wednesday by a fanatic crowd of a man described by friends and family as an artist eclipsed the fires after pictures and video of the scene …