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'.
More top news
East Midlands weather: Clear but becoming cloudy with some rain
West Midlands weather: Dry and clear, but becoming cloudy with rain.
Police say a man who who received multiple stab wounds after being attacked by a group in an alleyway is 'lucky to be alive'.