Early Wednesday morning just after midnight, in the 2600 block of E. Rick Drive. Officers and Saint Clair County Sheriff Deputies responded to a call concerning a hold up of a cab driver at gunpoint. Port Huron Police say an 18 year old city resident was in custody after allegedly threatening the cab driver with a gun. The handgun was not immediately located however the suspect was found about 6 blocks away. Charges in the case are pending.