One of the Bell's assumptions in the original derivation of his inequalities was the hypothesis of locality. That is why violations of these inequalities observed in experiments are often interpreted as a manifestation of the nonlocal nature of quantum mechanics. It is well known that the Bell's inequality was derived in its traditional form, without resorting to the hypothesis of locality and without the introduction of hidden variables, the only assumption being that the probability distributions are nonnegative. This can therefore be regarded as a rigorous proof that the hypothesis of locality and the hypothesis of existence of the hidden variables are not relevant to violations of Bell's inequalities. The physical meaning of the obtained results is examined. Physical nature of the violation of Bell inequalities is explained under new EPR-B nonlocality postulate. We show that the correlations of the observables involved in the Bohm-Bell type experiments can be expressed as correlations of classical random variables. The revisited Bell type inequality reads + + - 6 instead classical Bell type inequality + + - 2.