Tanzanian authorities have confirmed that 36 Iranian oil tankers have been using Tanzanian flags to evade US and EU imposed economic sanctions on Iran's crude oil exports.

The US House Committee on Foreign Affairs has accused Tanzania of collaborating with Iran on the flag-swapping - and has warned the African country that it could also be subject to sanctions unless they stop.

Karen Zarindast reports.

Video produced by BBC Persian's Amir Paivar