madrid catalonia create special commission investigate claim abuse spanish police ban referendum independence sunday 800 people leave injure leader region carles puigdemont say monday thousands spanish police ship region prevent vote secession though scenes violence due heavy-handed tactics armor baton-carrying riot units receive international condemnation vote constitutional court ban madrid say illegal yet still attract millions defiant voters valid bind puigdemont say conference catalan leader say contact spain central government call prime minister mariano rajoy say whether favor mediation talk region future oversee european union catalan commission investigate claim abuse ban referendum