unexplained

She wanted the general public to know that if they report suspicions about people in their communities with unexplained wealth, action will be taken.

A public inquiry into the circumstances around Letby's crimes heard a run of three unexplained deaths of babies on the neonatal unit in June 2015 were not reported as a serious incident by the hospital.

He, along with fellow Russian operatives Samer Sueifan and E Tsaryov, were detained in September on unexplained charges, before being freed and sent home earlier this month, according to the Russian embassy.

Other federal agencies are also investigating the health concerns of nearby residents who have been suffering respiratory illnesses and unexplained stomach bugs.

Whale stranding is an unexplained natural phenomenon, with New Zealand holding one of the world's highest rates of the event.