The alleged incident took place yesterday when the photojournalist was clicking pictures near the India Gate as parts of his assignment.
"Taking suo-motu cognisance of the incident, notices have been issued to the Commissioner of Police Delhi and Joint Commissioner (Traffic) Delhi for their responses," the PCI said in a release today.
PCI Chairman Justice Chandramauli Kumar Prasad also expressed "grave concern" over reports of police assault on the photojournalist.