A man with a goat arrested in Metro Line 1 in Paris

Commuters in Paris are used to disruption to their morning journey to work but they were left stunned and fairly angry over the reason for Tuesday's delay.

When Paris Metro authorities announced on Tuesday morning that traffic on the busy Line 1 was suspended weary commuters would hardly have been surprised.

Those who travel on line 1 know it's not the most reliable of Metro lines as of late, with frequent morning delays reported.

On Tuesday they were told the reason for traffic coming to an abrupt halt was an "act of malevolence" by a passenger.

It turns out the "malevolent" act was a man bringing a goat onto the Metro at the Tuileries station, which naturally caused a little panic among passengers.

"Stuck on the Metro because of a man with a goat!" tweeted Kenza Bennani. "He's refusing to get off."

"We heard a woman shouting "stop", "stop". Everyone got up thinking someone was being attacked," he said. "Then we saw this man with a goat. He refused to get off and the police were called."