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
Notts County sit top of League Two after a resounding victory against 10-man Lincoln City.
Generally fine and mild with clouds starting to clear overnight.
Largely dry overnight with a mixture of clear and cloudy intervals.