Police have launched an investigation into how Gaetano Lo Presti was able to commit suicide .
Police
['police', 'launch', 'investigation', 'gaetano', 'lo', 'presti', 'able', 'commit', 'suicide']
<m> Police </m> have launched an investigation into how Gaetano Lo Presti was able to commit suicide .
An alleged mafia boss who was arrested in a massive sweep by Italian police hanged himself in a prison cell within hours of being detained .
<m> Police </m> have launched an investigation into how Gaetano Lo Presti was able to commit suicide .
He was found dead in a cell in Palermo 's Pagliarelli prison late on Tuesday night , just hours after being picked up during raids by 1,200 police backed up by helicopters and sniffer dogs .