Hong Kong kung fu star Jackie Chan Wednesday apologized to the public after his son Jaycee Chan, also known as Fang Zuming, was detained in Beijing on drug charges last week.

"I feel very angry and astonished about what my son Fang Zuming had done. As a public figure, I feel shameful. As a father, I feel my heart wrenched," Jackie Chan said in the latest post on his official Sina Weibo account, after Jaycee Chan, 32, was detained on suspicion of providing a space for others to take drugs on August 14.

"His mother feels heart-broken. I hope teenagers can take Zuming as a lesson and stay away from drugs," Jackie Chan said.

He added in the post that he should take responsibility for his son's wrongdoing as a father and urged his son to accept the consequences. 

His son was detained along with Ko Chen-tung, 23, a movie star from Taiwan, after Beijing police found more than 100 grams of marijuana in Jaycee Chan's house in the Dongcheng district on August 14, Beijing police said Monday.

Jackie Chan was appointed as a goodwill spokesman for the China National Anti-Drug Committee in 2009.