Police fired tear gas to disperse small-scale traders protesting against an import duty hike, ​a Reuters witness saw on Friday, while hundreds ‌of businesses closed in central Nairobi.

The Kenya Revenue Authority said its decision to raise the duty with effect from August 20 aimed to curb under-declaration and undervaluation of imports, which it said disadvantage compliant businesses and local manufacturers.

Traders say the change would ​raise the cost of clearing goods and hurt small ​businesses that rely on consolidated shipments to reduce import costs.

"We are standing for our citizenship and our right to do ​business and our right to build our future," ​said Muturi Kariuki, who joined the demonstrations.

Kariuki was among the traders who closed their businesses to protest. Others did so for safety reasons, traders said.

Police did not immediately respond to calls or requests for comment.

The duty change raises the minimum customs benchmark for a consolidated 40-foot container from 2.5 million Kenyan shillings to 3.2 million Kenyan shillings ($24,700).

The authority said the 3.2 ​million ⁠shilling figure was a minimum reference point, not a fixed value for every container. Importers whose goods ⁠exceed that ​value must declare their actual ​worth and pay the applicable duties.