A cyclist's collarbone was broken in a collision with a car driven by Home Affairs Department secretary Mike Pezzullo in Canberra's parliamentary zone.

Home Affairs Department secretary Mike Pezzullo. Credit:Alex Ellinghausen

The department confirmed Mr Pezzullo was involved in a traffic incident on December 19, and said he had reported it that day to police.

ACT Policing said it had investigated the early morning incident at Walpole Crescent, one kilometre north-east of Parliament House.

After the collision at 6.30am, a bystander called emergency services and paramedics took the cyclist to Canberra Hospital. Police said they learned of the incident at 9.30am that day.