MADRID. REUTERS. A car bomb killed three people and injured at least 10 in a residential suburb of Madrid on Monday, an emergency services spokesman said, in what appeared to be the latest attack by the Basque separatist group ETA. The spokesman said one of the injured was in serious condition but added that he was due to receive further information on the number of victims soon. Radio reporters on the scene said the three dead had burned to death in a car after the explosion. Around 30 cars and a bus were caught up in the explosion, Spanish state radio said. It immediately blamed ETA, which has killed 16 people in similar attacks this year after ending a ceasefire in December.