An Apache AH-64 military helicopter crashed in Galveston Bay. Seconds before crash, helicopter was seen flying unusually low when it suddenly broke apart in the air, KSAT-TV said on Wednesday citing witness reports.

The local station reported citing the Army Air National Guard, that the two pilots on board the helicopter were killed in the crash.

Chief Warrant Officer 5 Glen Webb said as cited by Houston Chronicle late on Wednesday that the identities of the soldiers will not be released until their relatives are notified.

The Apache AH-64 was based at the Ellington Field Joint Reserve Base near Houston, Texas, Petty Officer 1st Class Andrew Kendrick told KSAT-TV. It was conducting a regular training mission and before that helicopter never encountered any problems.

Coast Guard divers are deployed to the scene. They are now searching the waters. Some fragments of the helicopter have already been found, but more details will follow.

An official inquiry will be made by the US Army Combat Readiness Center as to the cause of the crash soon as the search mission is done.