Mayor Thomas Menino announced an initiative Feb. 23 that will provide assessments and resources for security upgrades to convenience store owners in wake of the Feb. 21 killing of a convenience store worker on Dudley Street in Dorchester. “The shooting of Geraldo Serrano on Sunday morning is outrageous and we cannot allow this type of brazen behavior to be accepted in our city,” Menino said in a press release Feb. 23.