TERNI, Italy, June 29 (UPI) -- Italian weapons experts say tests on the type of rifle used to kill U.S. President John F. Kennedy show assassin Lee Harvey Oswald could not have acted alone.

The Warren Commission report concluded that Oswald fired three shots with a Carcano M91/38 bolt-action rifle in 7 seconds to kill Kennedy in Dallas in 1963. However, tests supervised by the Italian Army showed it would take 19 seconds to get off three shots with that type of gun, the Italian news agency ANSA reported.

The tests were done in a former Carcano factory in Terni.

In one test, a bullet was fired through two large pieces of meat to simulate the assumed path of a shot that the Warren Commission concluded struck Texas Gov. John Connally after passing through Kennedy's body. In the test, the bullet ended deformed, while the bullet in the Kennedy assassination remained intact.

Conspiracy theories about the assassination have been circulating for more than four decades.