MADRID (Reuters) - Spanish police are searching for an apartment where Islamist militants may be hiding after a weekend raid on another apartment ended with up to six suspects blowing themselves up, newspapers said on Wednesday. The Spanish government says most of the suspects in the Madrid 11 train bombings which killed 191 people have either been arrested or killed themselves in the weekend siege of an apartment in the Madrid suburb of Leganes. But a prosecutor has asked a judge to issue new arrest warrants in the investigation, news reports say, and police believe between one and three suspects...