Two U.S. Peace Corps volunteers arrested over Ghana killing By NBCNews.com staff and news services ACCRA, Ghana - Police in Ghana have arrested two U.S. nationals working as volunteers for the Peace Corps aid program in Ghana in connection with the killing of a local man who tried to rob them, police said Monday. A police officer in the northern town of Wa said the incident happened over the weekend when they were attacked by two robbers. One Peace Corps volunteer fought back with a knife, fatally wounding one of the assailants, the officer, who declined to be named because he was not authorized to speak to media, told Reuters. According to a report in the Accra-based newspaper the Daily Graphic, cited by Bloomberg, the thief had attacked one of the volunteers with a machete. The U.S. Embassy in the capital Accra confirmed that police were investigating an incident involving Peace Corps volunteers. "They were involved in a safety and security situation in the early hours of Saturday and the police are investigating," embassy spokeswoman Sara Stryker said.