Police in northern Mexico have arrested three 16-year-old boys for the stabbing death of a man during a bicycle robbery. The three are being tried as minors. The state prosecutors' office in northern Sonora state said Sunday in a statement the three confessed to the crime. The office said they are being held at a youth offenders facility. The man died in September after being stabbed while the youths tried to steal his bicycle in Hermosillo, AP reported.