Volleys of gunshots were heard at the Philippine Senate on Wednesday and people were told to run for cover, Reuters witnesses heard, as chaos mounted in anticipation of an attempt to arrest a top senator wanted by the International Criminal Court.It was unclear what was happening or who fired the shots. More than 10 military personnel in camouflage fatigues had earlier arrived at the Senate building, some carrying assault rifles, Reuters journalists saw.It was not immediately clear why...