Police have neutralised 24 drug dens after raids in 42 premises in Yau Ma Tei since April 14.

Twenty-one women and 181 men aged 18 to 66 were arrested for offences including keeping a divan (drug den), and trafficking in and consuming dangerous drugs. They are being detained for enquiries.

Officers seized about 1.77kgs of suspected heroin, 320 grams of cocaine and a small amount of 'ice' worth about $1.18 million.

Police reminded landlords to contact the Police if they suspect drug activities are taking place inside their premises.