A76 is closed in both directions closed due to shed load of glue and overturned lorry between B740 (Sanquhar) and B797 (Mennock).
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Sharon Grierson died in hospital from a lack of oxygen after a breathing tube was accidentally put into her oesophagus.
The boys, all aged under 16 and from west Cumbria, have been on trial at Carlisle Crown Court during the past fortnight.
Four flood warnings are currently in place across parts of southern Scotland.