Search for the decay πO → 4γ

We have searched for the decay π^O → 4γ using the decay K^± → π^±π^O as a source of kinematically defined π^O,s. No events were observed, where one event would correspond to a branching ratio (π^O → 4γ)/(π^O → 2γ) of 2.7 × 10^?5.