Lee Harvey Oswald could not have acted alone in assassinating President John F Kennedy, according to a new study by Italian weapons experts of the type of rifle Oswald used in the shootings.

The new findings will encourage conspiracy theorists
In fresh tests of the Mannlicher-Carcano bolt-action weapon, supervised by the Italian army, it was found to be impossible for even an accomplished marksman to fire the shots quickly enough....

The official Warren Commission inquiry into the shooting concluded the following year that Oswald was a lone gunman who fired three shots with a Carcano M91/38 bolt-action rifle in 8.3 seconds.

But when the Italian team test-fired the identical model of gun, they were unable to load and fire three shots in less than 19 seconds - suggesting that a second gunman must have been present in Dealey Plaza, central Dallas, that day....

The findings will be a frustration to Vincent Bugliosi, the author of a 1,600-page book, also published in May, which claimed to put to rest all the conspiracy theories of the past 44 years.

The Italian findings will be hotly contested by those who believe that Oswald was a lone gunman - not least because they contradict firing tests previously conducted, using Oswald's actual rifle, by the FBI and the US Marines, and another study by Washington police marksmen using an identical gun.

Oswald would only have needed to reload the weapon twice in the eight seconds to get off all three shots, since the time was measured only from the moment he fired the first shot. The FBI concluded that a marksman could have fired a shot at least every 2.3 seconds.

In his book, Mr Bugliosi details how after just two or three minutes' practice with the gun in 1979, three police marksmen aiming at three targets representing Kennedy at the same distance from Oswald, got away three shots in less than eight seconds.