DIG Western Province North Vaas Gunawardhana was arrested by the CID yesterday.
Police Media spokesman SP Buddhika Siriwardhana said that querying the DIG was taking place now.
The CID began querying the DIG Western Province North on 6th instant.
That was in connection with an incident of abducting a Bambalapitiya businessman and shooting him dead on 22nd.
Another six police officers attached to the Peliyagoda police were arrested on 6th instant in connection with the incident.
Among these were an SI and three police constables.
In addition the Colombo Crime Division arrested two civilians as well.
The police media spokesman said that all these suspects were under CID custody on detention order.