The type of weapon, how itwas obtained and how many shots were fired during the incident were not being released due to the ongoing investigation, Sisson said.
The company had already planned to retire another coal-fired power plant in Kentucky that is covered by the settlement, even though itwasnot required to stop using coal.
Yemeni defence ministry officials told Associated Press that the militants killed were travelling in a car and that itwas hit by a missile believed to have been fired by a US drone, although this has not been confirmed.