Docker DELETE commands gets executed every half hour

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I’m new to docker and was going through docker logs and found DELETE command being executed every half an hour

time="2017-10-09T09:36:39.757830525Z" level=error msg="Handler for DELETE /v1.17/images/sha256:69522f5b2cfaf11703b4911fe40c2dc8e1f1469ab756910f0cf679e2b1db1960 returned error: conflict: unable to delete 69522f5b2cfa (must be forced) - image is being used by stopped container f7142fd07c44"


time="2017-10-09T10:06:39.758068930Z" level=error msg="Handler for DELETE /v1.17/images/sha256:69522f5b2cfaf11703b4911fe40c2dc8e1f1469ab756910f0cf679e2b1db1960 returned error: conflict: unable to delete 69522f5b2cfa (must be forced) - image is being used by stopped container f7142fd07c44"


time="2017-10-09T10:36:39.757730005Z" level=error msg="Handler for DELETE /v1.17/images/sha256:69522f5b2cfaf11703b4911fe40c2dc8e1f1469ab756910f0cf679e2b1db1960 returned error: conflict: unable to delete 69522f5b2cfa (must be forced) - image is being used by stopped container f7142fd07c44"


time="2017-10-09T11:06:39.757938287Z" level=error msg="Handler for DELETE /v1.17/images/sha256:69522f5b2cfaf11703b4911fe40c2dc8e1f1469ab756910f0cf679e2b1db1960 returned error: conflict: unable to delete 69522f5b2cfa (must be forced) - image is being used by stopped container f7142fd07c44"

Any Idea why DELETE command is being executed repeatedly? How do i debug it?
We use Amazon ECS Optimized image ( ami-cf03d2ac ).