HONG KONG, Dec. 2 -- Hong Kong Customs said on Monday that the authority seized about 180 grams of different kinds of suspected drugs during a special operation at two boundary control points from Oct. 28 to Nov. 30.

This special operation codenamed "Propeller" started with a view to stepping up enforcement action against drug trafficking between Hong Kong and Macao.

The suspected drugs seized during the operation, including cocaine, methamphetamine and ketamine, were found concealed inside the underwear or shoes the arrested persons wore, and were packed in small packages ready for distribution.

Seven men including a 17-year-old student were arrested. The other six were aged between 18 and 61.

Under Hong Kong's Dangerous Drugs Ordinance, trafficking in a dangerous drug is a serious offence. The maximum penalty upon conviction is a fine of 5 million Hong Kong dollars (640,000 U.S. dollars) and life imprisonment.

The Hong Kong Customs said it will continue stringent law enforcement at every boundary control point to combat cross-boundary trafficking activities involving dangerous drugs.