four people kill thursday helicopter belong utility hydro one crash central ontario company say statement hydro one provide detail four employees kill crash say name would release next kin notify company base ontario say emergency service site tweed area rural central ontario 250 kilometers 155 miles toronto say notify appropriate oversight group ontario provincial police say statement officer respond crash shortly 12:30 pm et 1730 gmt join emergency response service include forensic identification unit police say canada transportation safety board would investigate woman name kim clayton tweet hydro one staff work power line property crash wednesday small airplane carry 22 passengers three crew members crash take canadian province saskatchewan four kill canada helicopter crash