Wichita ? A woman whose husband and three young children were slaughtered during the 1994 Rwandan genocide cried as she identified from the witness stand the Kansas man she contends led a mob attack in the African nation.

Her account was the most emotional yet as the trial of Lazare Kobagaya entered its fifth day of testimony in a federal courtroom in Wichita. The government is seeking to revoke his U.S. citizenship for allegedly lying to immigration authorities about his involvement in the genocide.

The 84-year-old Topeka man is charged with unlawfully obtaining U.S. citizenship in 2006 with fraud and misuse of an alien registration card. Prosecutors have said it’s the first case in the United States requiring proof of genocide. Kobagaya contends he is innocent.