Five people have been arrested after police raids, including at the offices of the CFMEU, as part of an investigation into information provided about secret commissions.

The union headquarters in Carlton was one of six addresses where search warrants were executed this morning.

“A very significant day of police action,” Nick McKenzie, investigate reporter at The Age, told Jacqui Felgate on 3AW Drive.

Press PLAY to hear his insight (including his thoughts on Ben Carroll’s royal commission call)

“It’s very troubling for the CFMEU.”

Images: Nine, Darrian Traynor/Getty