The police arrested three suspects wanted in sectarian killings in Karachi on Wednesday while officials revealed that security forces arrested a leading Sunni Muslim militant accused of involvement in two failed assassination attempts on President Pervez Musharraf in Lahore last week.Ghulam Mustafa Tabassum, of the outlawed Lashkar-e-Jhangvi militant group, was arrested in late December in the eastern city of Lahore, said an intelligence official, who did not want to be identified. âHe is amongst the top nine terrorists in the country and was also involved in the planning of two failed assassination attempts on President Musharraf,â the official added, referring to attacks in Rawalpindi in December 2003.