Detective Inspector Warren Hines of West Midlands Police told ITV News that police have arrested one suspect in connection with the deaths of two people at a block of flats in Walsall.
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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.