By Luke Baker

LONDON, Oct 26 (Reuters) - A British private security company is being sued in the United States over the death of a U.S. soldier hit by one of its convoys in Iraq, according to court documents.

The case, believed to be the first of its kind, comes six weeks after Iraq accused the U.S. security company Blackwater of using excessive force in an incident where 17 Iraqis were shot dead in Baghdad.

The case against Erinys, filed in a court in Houston, Texas, on Wednesday and also in London, was brought by the Perry Monroe, father of Christopher Monroe, a U.S. soldier who was struck by an Erinys vehicle while on duty in southern Iraq in October 2005.

The lawsuit accuses the Erinys convoy of ignoring warnings and travelling at excessive speed after dark without lights fully on, leading to an accident in which Monroe was hit, suffering severe injuries that led to his death.

"Even though warned that the remainder of the U.S. convoy was ahead, the Erinys PSD team employee with reckless disregard accelerated to a high rate of speed and struck Christopher with his armoured Suburban [vehicle], tearing off his right leg.

"Mr Monroe has been compelled to file this lawsuit to require the Erinys PSD team to account for its action that led to the death of his 19-year-old son," reads the suit, which also seeks unspecified damages.

Erinys, which provided security to the U.S. Army Corps of Engineers at the time of the incident, denied any wrongdoing.

"This was nothing but a very, very tragic accident," its chairman Jonathan Garratt told Reuters in London on Friday.

"There was a full and very thorough investigation by the U.S. military into the case at the time, and both Erinys and its employees were fully exonerated."

The case is the latest to shine a critical light on the work of the two dozen or so private security companies operating in Iraq, some of which have earned hundreds of millions of dollars from contracts awarded by the U.S. government.

While Blackwater, which the Iraqi government wants to ban from Iraq, has received the most high-profile criticism, other companies have also been accused of using excessive force or of having little regard for Iraqi civilians.

The case filed in Houston is the first time that a private security company has been accused of negligence in the case of the death of a U.S. soldier, lawyers said.

Asked why the suit was being brought now, Tobias Cole, the lawyer who filed it, denied it had been motivated by the Blackwater incident.

"There's not necessarily some strategic timing to this lawsuit," he said. "The family wanted answers and under Texas law you only have a certain amount of time to seek those answers."

Garratt said he believed the case had been filed within one day of the expiry of the statute of limitations.

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