Derry video: PSNI accused of ignoring 'incapacitated' woman at side of road
19 March 2014 Last updated at 09:11 GMT
The BBC understands the PSNI are to refer a video that appears to show officers leaving an incapacitated woman at the side of a road to the police ombudsman.
In a statement, Assistant Chief Constable George Hamilton said, at a first view of the video, police were seriously concerned. He said it was "well below the standards we expect from our officers in dealing with vulnerable people, whether the vulnerability is due to alcohol or anything else."