What cause engine piston to break and make hole on the engine block

Hi, I recently (two and half months ago) got the timing belt changed. A week ago, as I was driving on the free way, I heard a big bang and the engine stooped. My insurance appraiser looked at it and find there were a hole on the engine block and peaces of the piston where everywhere. He told me my timing chain might have been broken and that is what caused the damage. I want to make sure the timing failure can cause the issue. If no what can be the reason of the issue?