NSW’s Independent Commission Against Corruption (ICAC) has raided the headquarters of the New South Wales Labor Party in Sydney.

Reports say staff from the corruption watchdog arrived at the party's Sussex Street headquarters on Tuesday morning looking for documents relating to an ongoing investigation into ALP donations.

Officials are allegedly searching for financial documents linked to an annual party fundraising event called the Chinese Friends of Labor.

More details about the reason for the raid are not yet known.

Senior Labor officials including NSW ALP boss Kaila Murnain were attending the party's national conference in Adelaide at the time, so they were not present during the raid.

Neither NSW ICAC or Labor have commented further.