Singapore said Monday it will impose a blanket ban on the domestic sale of elephant ivory and products from 2021 as the government tightens its campaign against illegal wildlife trade.

The announcement on World Elephant Day followed two years of consultations with non-government groups, ivory retailers and the public.

Authorities in the city-state made their largest ever seizure of smuggled ivory last month, impounding a haul of nearly nine tons of contraband tusks from an estimated 300 African elephants valued at $12.9 million.

The illegal cargo was discovered in a container from the Democratic Republic of the Congo being shipped to Vietnam via Singapore and also included a huge stash of pangolin scales.

Singapore has banned international trade in all forms of elephant ivory products since 1990. Such items could be sold domestically if traders could prove they were imported before that year or acquired prior to the inclusion of the relevant elephant species in an international convention protecting endangered species.

In a statement Monday, Singapore's National Parks Board banned the sale of elephant ivory and products with effect from September 1, 2021.

Violators face a jail term of up to one year and fines on conviction. Traders can donate their ivory stocks to institutions or keep them after the ban takes effect, the board said.