Police: Gang member caught in East Boston with spray paint, large knife

District A-7 reports a guy "known to officers as a gang member" was spotted spraying the letter "S" on a wall at 259 Bennington St. around noon on March 17. Why an "S"? Officers found a further clue at 251 Bennington St., where they found a recently applied "MS," as in MS-13, a Central American gang with members up this way. Police add:

During the search of the suspect the officer pulled from the suspect's waistband on the right side a knife which is about 17 inches long.