Derry video: Police say video showing officers leaving woman in bus lane was 'horrendous'
19 March 2014 Last updated at 12:57 GMT
PSNI Assistant Chief Constable George Hamilton has described video footage that appears to show police officers leaving a incapacitated woman in a bus lane as "horrendous".
Mr Hamilton said the police service exist to keep people safe and that video showing officers leaving the woman in a bus lane "does not look good".
The Police Service of Northern Ireland (PSNI) said it would refer the matter to the Police Ombudsman.