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 .
detained
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An alleged mafia boss who was arrested in a massive sweep by Italian police hanged himself in a prison cell within hours of being <m> detained </m> .
An alleged mafia boss who was arrested in a massive sweep by Italian police hanged himself in a prison cell within hours of being <m> detained </m> .
Police 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 .