Denver: Australian identical twin sisters shot themselves on a US shooting range in an attempted joint suicide pact, the local sheriff`s office said, after speaking to the surviving woman.
Officials confirmed the suicide theory as the parents of the 29-year-olds reportedly flew from Australia to identify their daughters, whom the local sheriff`s office said had been in the western state of Colorado for five weeks.
The double shooting occurred on Monday afternoon at the Cherry Creek State Park in Arapahoe County, east of Denver.
Investigators have "met with the surviving sister, who has confirmed that they had planned to commit suicide together, and did in fact shoot themselves," said a statement by the county sheriff`s office.
"Based on the physical evidence collected, the surviving sister`s statements, and video surveillance footage from the shooting centre, they believe that this incident was indeed a suicide and attempted suicide."
"A reason for the shootings is still unknown even after interviewing the surviving sister for about two hours on Thursday," the sheriff`s office Captain Louis Perea said.
"We asked that question more than once, and the survivor declined to answer the question," he added.
Giving details of the incident, the sheriff`s office said: "One victim was pronounced dead at the scene, the second victim was transported to an area hospital for treatment.”
"The women had been staying in the Denver area for approximately five weeks prior to the shootings.”
Australian media reports said the women were firing small-calibre guns in the same stall at the Family Shooting Centre, when both suddenly collapsed to the ground with bullet wounds to the head.
Investigators here said the guns used were both .22 calibres -- one revolver and one a semi-automatic.
The parents of the twins, who have not been named but were 29 years old according to officials here, are flying to the western US state to identify their daughters, according to Australian media.
Captain Perea said investigators hope to talk with the parents after they arrive in Colorado on Friday afternoon.
"Obviously, our first priority is to positively identify the victims," Perea said, adding that officers would continue to withhold identities until a positive identification is made.
No criminal charges are contemplated as attempted suicide is not a violation in Colorado.