Three brothers have gone missing from their foster home in Sunderland.
They went out for a bike ride on Monday, but did not return. Police say Remus, Janko and David Matlock are Polish, but speak good English.
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It comes after security was stepped up around the country following the Manchester Arena attack which killed 22 people.
The distress signal sparked a police hunt in the area to find the person or group who made it.
The seven-month-old baby girl is believed to have been left in a car in Co Tipperary for several hours.