Just before Midnight on Monday, 2 men wearing black ski masks and armed with handguns walked into the 7-Eleven on Rockdale Ave in New Bedford.  They pointed their weapons at the female cashier and demanded cash from the registers.   They fled south on Rockdale with cash and cigarettes.   One of the robbers is tall and weighs about 200 pounds.  He was wearing a blue-hooded sweatshirt.  The other is about 5'10, weighs between 170 and 190 pounds, and was wearing a black-hooded sweatshirt.  Anyoen with any info about the robbery is asked to call Detective Scott Brown at 508-991-6300, extension 131.