Bond Air Services says it has temporarily grounded 38 EC135-model helicopters globally after discovering a "defect", Reuters reports.
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The jury convicted Cilliers of two attempted murder charges and a third count of damaging a gas fitting.
Demi Pearson, 15, her brother Brandon, aged eight, seven-year-old sister Lacie, and sister Lia, three, all died.
Irish ex-pats from all over the world are returning home to cast their votes in the upcoming referendum.