The U.S. Ambassador to Zimbabwe says about 200 people are seeking refuge at the American embassy in the capital.

James McGee said by phone Thursday that the group was from the opposition headquarters in Harare. Opposition supporters have been coming under attack from supporters of President Robert Mugabe.

Riot police were seen at the embassy as well as people with small bundles of possessions. Police said they did not have immediate comment.

McGee said embassy officials were working with humanitarian organizations to find accommodation for the group.

More than 300 opposition supporters who sought refuge at the South African embassy last week were taken to a camp outside the capital.