School explosion investigation could take a year according to NTSB

MINNEAPOLIS — Workers may have been moving a gas meter when an explosion tore through a Minneapolis school building this week, killing two people and injuring at least nine others, according to federal investigators who arrived Thursday.A team from the National Transportation Safety Board was in Minneapolis to begin the painstaking task of determining what caused Wednesday's natural gas explosion at Minnehaha Academy. The bodies of two school workers — longtime receptionist Ruth Berg