KUALA LUMPUR, Oct. 28 -- A 37-year-old Malaysian motorcyclist was arrested at Tuas Checkpoint for allegedly attempting to smuggle a bottle of suspected kratom liquid into Singapore, the Immigration and Checkpoints Authority (ICA) said.

According to a Facebook post cited by AsiaOne, ICA officers stopped the man for further inspection on October 14 after he claimed he had nothing to declare.

"A thorough check uncovered a bottle containing suspected kratom liquid in the man's bag," ICA said.

The case has been referred to the Central Narcotics Bureau for further investigation.

Kratom, also known as "biak", "kakuam", "ketum", "thang", or "thom", is a tropical plant native to South-east Asia.

Its leaves can be consumed in various forms, su...