The owner of a tugboat that collided with a ship last month, dumping nearly 170,000 gallons of oil into the Houston Ship Channel, claims in court filings the ship was speeding and being operated in a reckless manner.

Houston-based Kirby Inland Marine alleges in court documents filed earlier this month that the March 22 collision, which occurred after the ship struck a barge the tugboat had been pulling, was caused by gross negligence on the part of the ship's owner, Sea Galaxy Marine based in Liberia in West Africa. In its own court filings, Sea Galaxy says the collision was not its fault.

The U.S. Coast Guard, which is still investigating the cause of the accident, did not immediately return a call Thursday seeking comment on the claims being made by the companies.

Two barges that were being pulled by the Kirby Inland-owned tugboat Miss Susan had been leaving Texas City and heading for the Intracoastal Waterway while a Sea Galaxy-owned inbound ship, the Summer Wind, was traveling through the Houston Ship Channel. The collision happened when the barges made a left turn to enter the Intracoastal Waterway and were crossing the ship channel.

But Kirby Inland alleged in court documents filed earlier this month that the tugboat had broadcast its position to let all vessels in the vicinity know its position. At the time, the Houston Ship Channel was under a fog advisory.