NEW : The United States summons the Syrian ambassador in Washington . Syria says Daraa citizens wanted the government to ' ` ` terrorist groups '' Witnesses added that ambulances were not allowed into the city and that electricity and phone lines were down . The United States is considering new sanctions . Syria says ` ` martyrs '' killed and injured by ` ` armed criminal groups ''
NEW : The United States summons the Syrian ambassador in Washington . Syria says Daraa citizens wanted the government to ' ` ` terrorist groups '' The United States is considering new sanctions . Syria says ` ` martyrs '' killed and injured by ` ` armed criminal groups ''