The Cove Road 7-Eleven store was held up early Monday, and the suspected robber was taken into custody a short time later.  Fast forward to Tuesday at 9 p.m.  Another man, armed with a knife walked into the very same store and demanded cash.  Police say he was white, in his 20's, has brown hair and wearing a blue, hooded sweatshirt.  They believe they found the knife used in the robbery, and as last report, they were chasing a suspect.