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
Residents say their lives are being blighted by a huge stack of hay bales dumped right next to their homes in Ockbrook, Derbyshire.
Police are searching three addresses in the Midlands after a suspected terror attack outside the Houses of Parliament.
A terror suspect accused of deliberately crashing a car outside the Houses of Parliament is understood to be from the Birmingham area.