Sanremo, August 6 - An autopsy shows a suspected drug dealer who died in June after being arrested by Italian police suffocated after suffering pressure on his chest, a prosecutor said Tuesday. Bohli Kayes, a Tunisian native, died at the police station in Riva Ligure on June 6. "This is a serious responsibility for the State," said one prosecutor. Originally, investigators were not sure if Kayes had stopped breathing because of previous drug use or trauma. Three police officers involved in his arrest are under investigation for possible manslaughter in Kayes' death.