NEW : A protester in Benghazi says ranks have swelled ; a major rally is set for Sunday . NEW : The U.S. State Department has warned Americans to avoid all travel to Libya, and the White House said it was monitoring developments there. An Army official siding with the opposition says government `` caused a massacre '' To counter that , the government is using `` military squads of African origin , '' the source said , voicing the same claim made by Majbari . Libyan government 's tight controls make it difficult to verify information .
NEW : A protester in Benghazi says ranks have swelled ; a major rally is set for Sunday . NEW : The U.S. State Department has warned Americans to avoid all travel to Libya, and the White House said it was monitoring developments there. An Army official siding with the opposition says government `` caused a massacre '' Libyan government 's tight controls make it difficult to verify information .