GROZNY, Russia, Dec 18 (Reuters) - One prison guard was killed and five were wounded on Tuesday by a roadside bomb near their vehicle in Russia's Chechnya region, a prison official said.

The guards were riding in a convoy of vehicles escorting detainees to a local court and had just crossed a bridge when the explosion occurred, the official told Reuters.

No detainees were wounded and all were returned to the jail.

A spokesman for the Ministry of Internal Affairs in Chechnya, which oversees the police in the southern Russian region, could not be reached for comment. (Writing by Chris Baldwin, editing by Stephen Weeks)

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