Federal prosecutors have asked for a delay in the sentencing of a New Hampshire woman convicted of lying about her role in the 1994 Rwanda genocide to obtain US citizenship. The Boston-based lawyers have been heavily involved in response to last month’s Boston Marathon bombings. Beatrice Munyenyezi was convicted in federal court in Concord in February. She faces up to 10 years in prison and deportation. Her sentencing was scheduled for June 3.