Contributions from the reaction e⁺e^- \to \pi ⁺\pi ^- e⁺e^- to the pion form factor measurement via radiative return method are discussed basing on the results of a Monte Carlo generator (EKHARA). The generator contains contributions from the initial and final state emission of a e⁺e^- pair from e⁺e^-\to \pi ⁺\pi ^- production diagrams and the \pi ⁺\pi ^- pair production from space-like and time-like Bhabha diagrams. A detailed study is performed for the {\Phi }-factory energy. Tests of the generation procedure are also presented.

PACS numbers: 13.40.Ks, 13.66.Bc