FORT WORTH, Texas (CBSDFW.COM/AP) — Investigators will consider storm-related flooding to help determine what caused an April 24 freight train derailment in North Texas that sent 25 tanker cars off the tracks.

The National Transportation Safety Board on Monday issued a preliminary report on the accident south of downtown Fort Worth.

Officials said at least three horses were killed and several Texas homes were evacuated when the Union Pacific train hauling flammable liquid ethanol derailed and caught fire.

The NTSB statement says the derailment happened amid heavy rainfall and a large amount of water from nearby Lake Echo flowed through the railroad right of way.

Safety issues to be reviewed include effective weather alert communications and inspection and maintenance of storm water drainage from lakes.

Six years ago, a Union Pacific Railroad line was shut down after a train derailment near Aldedo. Nine cars and locomotives went off the tracks and one crewmember was hurt.

The line, near the intersection of Aledo Road and Markum Ranch Road was opened shortly after the investigation ended.