Police at Tan Son Nhat International Airport in Ho Chi Minh City Tuesday caught a Vietnamese woman with 2.6 kilograms of heroin on a flight from Qatar and handed her over to the drug squad.
Nguyen Thi Lanh, 43, a local, was allegedly carrying the synthetic heroin hidden in a modified suitcase.
Details about her suppliers and customers are not known yet.
On Wednesday night police at the Mong Cai border gate on the China border arrested 25-year-old Chinese man Chen Wen Bo when he attempted to smuggle 10.5 kilograms of heroin into his country.
Bo said he was hired to fetch the cargo from Hanoi by a man named Kris in China, whom he described only as black.
He had made a successful trip a month ago, he said.
Investigations are continuing into both cases.