Tyler police need your help finding the man who tried to rob an Exxon gas station wearing a gorilla mask. It happened Tuesday morning on Glenwood and Vine. The clerk caught the culprit in the act. On the surveillance video you see the man directing the clerk to back of the counter to open the registers. Moments before, the man tried to open the registers on his own and failed, but it caused the registers to lock themselves and not open at all. The man instead grabbed the clerk's purse and walked out the store. He is still on the loose. If you have any information, call Tyler police.