Supt Kevin Purcell, of West Mercia Police has said four children were playing near the lock, but two fell in and another then went to try and get them out, while the fourth ran home to raise the alarm.
This video shows the canal where three children entered the water. Police say they are 'working hard to establish exactly how Imie came to be in the water'.
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After a chilly start, Thursday looks set to be a fine, crisp autumn day with light breezes and good spells of sunshine across the region.
A dry and often sunny day is expected with light and variable winds. Feeling cooler with temperatures slightly lower than Wednesday.
A clear night. Dry and sunny weather to end the week.