(AGI) Palermo, July 19 - The crew of a merchant vessel foundaround 20 immigrants dead in the hold of a boat intercepted onFriday night off the coast of Lampedusa. The immigrants wereprobably killed by carbon monoxide fumes. Three others were inserious condition. One of them was taken to Lampedusa by theItalian coastguard, but died on the way. The other two weretransported to a hospital in Palermo by helicopter. Themerchant vessel has taken the remaining 600 people on board. . .