Truong Quang Hoai Nam, chief of the Market Control Department, merely said it is still being investigated.
The market management agency carried out inspections in Hoang Mai and Thanh Tri districts following media reports that several locals had accidentally bought the rice, he said.
Newswire Dan Tri Tuesday quoted Duy Manh, a university student in Hoang Mai, as saying that the rice he bought from a store in Giap Nhi District smelled of plastic, with the odor worsening on cooking.
The grain was longer and bigger than usual, and thus more appealing, but did not become fluffy when cooked, Manh said, adding that he had bought five kilograms of at VND14,000 (US$0.67) each.
Moreover, the rice does not spoil even after four days, the newswire reported
Consumers advised against using strange rice
Vietnam firms call for calm amid plastic rice scare
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In February last year many Ho Chi Minh City residents had sent rice samples suspected of containing plastic to newspapers.
They said it was cheaper than normal rice, looked thinner and longer, had no broken grains, and was elastic.
The Cultivation Department had asked people not to buy the rice and wait for official test results, but made no announcement subsequently.
Earlier, in January last year, Vietnamese rice companies denied the possibility of a variety of Chinese rice, said to be made of potatoes, sweet potatoes and plastic, being sold in local markets. A Korea Times report said the fake rice was being sold in China's Shaanxi Province.