Gerry Brownlee was hit by a "lumpy ice cream brown substance" after today's Christchurch earthquake memorial service. <br /> <br />Brownlee 'bewildered' by heckler after memorial <br /> <br />Police have arrested a man who threw a brown substance on Minister Gerry Brownlee at the earthquake memorial service in Christchurch this afternoon. <br /> <br />The 41-year-old man has been charged with assault for the incident. <br />"It's just one little thing that mars an otherwise pretty successful memorial service I think," Mr Brownlee says. <br />"He's probably got issues, I don't know, it will come to light eventually exactly what it was all about and where he's from." <br /> <br />He didn't want to speculate what the substance was but said it wasn't very pleasant and it certainly wasn't ice cream. <br />An eyewitness says he was covered in some kind of "lumpy ice cream brown substance", which went down the front of his suit and down his face. <br />The man says Mr Brownlee looked annoyed and a bit bewildered after the incident. <br /> <br />Mr Brownlee was quickly escorted away after the incident as well as Prime Minister John Key. <br />The man is due to appear in Christchurch District Court tomorrow.