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Regional rights groups have called for an investigation, and Amnesty International said Tanzanian authorities should hold to account those responsible for the "inhuman" treatment.

"The United States remains fully committed to hold to account those responsible for contributing to chemical weapons proliferation," Bruce added.

Azerbaijan insists it is complying with international legal standards, and that it has a responsibility to hold to account those suspected of having committed war crimes.

After six breaks of throw to start the final, Bunting took out 96 in two darts for the first hold to go 4-3 ahead.

That was followed by a hold to love for American third seed Fritz, which set up a nervier finish than Draper would have hoped for.