A highway between Tennessee and Texas was temporarily closed down after a Greyhound bus driver lost several canisters of frozen bull semen.

Four canisters fell from the vehicle and started emitting a "light vapour" and bad odour on a ramp near Nashville.

Emergency services shut down the road while they tried to discover the contents, Reuters reports.

Fire department spokeswoman Maggie Lawrence said: "We didn't know what it was, but we were told [the canisters] were non-toxic."

On learning the contents of the canisters, the fire department and Tennessee Department of Transportation cleared the ramp.

Transportation spokeswoman B.J. Doughty said: "It was no different to us than if a mattress fell off a truck."

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