What is the police doing about it? Are they going to find out who is responsible and arrest the culprit?

Jasin Umno Youth chief Jezlee Tit today admitted that they were part of the protest at yesterday’s event in Merlimau featuring Bersih's Ambiga Sreenevasan, but denied responsibility for the throwing of eggs and stones.
If the police does not take action, they must do the same if the opposition apply the same tactic

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