Dozen arrests over drug syndicate in Vic

Twelve people have been arrested over an alleged drug trafficking syndicate in Melbourne's southeast.

Anti-bikie taskforce police raided eight properties in Keysborough, Cranbourne North, Springvale South, Mulgrave and Dandenong North on Tuesday into the secret drug ring.

Officers seized heroin, ice, cannabis, precursor chemicals, cash, a motorcycle, jewellery, pistols and tasers during the raids. Nine people were arrested during the raids.

Another four properties were raided in Narre Warren South, Dandenong North and Springvale South on Thursday, with more cash found.

Three more men were charged with drug offences.

Eleven of the men and women have faced court and one person is still expected to be charged on summons. The investigation is ongoing.