A gunman opened fire on the United States embassy in the Bosnian capital Sarajevo on Friday, a Reuters witness said, and at least one embassy security guard was wounded.

Bosnian state radio reported that the gunman, armed with a Kalashnikov rifle, had been shot by a police sniper after a stand-off. A police spokesman said the man appeared to be wounded but still alive.

Police cordoned off the area in the central business, university and shopping district of the city.