We analyze the Belle data [K. F. Chen (Belle Collaboration), Phys. Rev. Lett. 100, 112001 (2008); PRLTAO0031-900710.1103/PhysRevLett.100.112001I. Adachi (Belle Collaboration), arXiv:0808.2445] on the processes near the peak of the resonance, which are found to be anomalously large in rates compared to similar dipion transitions between the lower resonances. Assuming these final states arise from the production and decays of the state , which we interpret as a bound (diquark-antidiquark) tetraquark state , a dynamical model for the decays is presented. Depending on the phase space, these decays receive significant contributions from the scalar states, and , and from the -meson . Our model provides excellent fits for the decay distributions, supporting as a tetraquark state.