I haven't heard about this kind of case. but I know similar case. = I haven't heard about this kind of case. But I know a similar case.
There was a huge painting on the wall of shopping mall. = There was a huge painting on the wall of the shopping mall.
a couple made doodle on it. they arrested they thought it was a activity,
Because there were crayon near the painting. =  A couple doodled on it and were arrested. They thought it was an interactive activity because there was a crayon placed near the painting.
I have no idea about how they handle this issue but I heard that from news, which was hot.
Most of people blamed them. = Most of people blamed them.