These and more are the stuff that by-elections (and political campaigning) in Malaysia are made of. Of course, accusations like these get thrown about by everybody - usually at the opposition coalition - but nobody takes responsibility.
As long as these campaign materials do not originate from a certain party, it is apparently alright to use them.
I find the whole exercise of using the racial and religious card utterly despicable and beneath contempt. It's flinging mud at the other person with earth dug from under your feet.