Officials released the first minute of a 911 tape in the double murder of two young girls gunned down on a rural road in the hope that it will spark new leads in a case that has stymied investigators for seven weeks.

"They went for a walk and they're both, they're dead!" a female relative screams to the 911 operator, begging her to "help me please."

Click here for a transcript of the tape.

Taylor Paschal-Placker, 13, and Skyla Whitaker, 11, were found shot to death June 8 close to Taylor's home in rural Weleetka, Okla.

"It breaks your heart hearing it, doesn't it?" Jessica Brown, a spokeswoman for the Oklahoma State Bureau of Investigation, said at a press conference held Monday. The agency released the first 1 minute, 22 second portion of the more than six-minute-long tape after consulting the victims' families.

"We’ve gotten so many leads in. We just need that right one," Brown told FOX News on Monday. "And we’re hoping that this will stir some emotion in the people or the person who has information that can help break this case."

"We know someone out there knows what happened or has a good idea of what happened and can help us with this case," she said.

Brown said investigators have received more than 500 leads in the case and eliminated 100 people in the case.

Officials had released a sketch of a person of interest in the case who they believe may have seen the person or people responsible for the girls' deaths, but Bureau of Investigation officials have been tightlipped since.

Click here for photos.

The man is described as an American Indian, about 6 feet tall, with black hair and a ponytail stretching to the small of his back. Investigators say the man was seen standing near a white Ford or Chevrolet single cab pickup with chrome striping and an Oklahoma license tag around the time and place the girls were shot.

The girls were shot a number of times in the head and chest with weapons of two different calibers, leading authorities to think two gunmen were involved. Investigators also believe that bullet casings collected near the crime scene could be linked to the homicides.

More than $30,000 in reward money is available for information leading to an arrest and conviction.

The Associated Press contributed to this report.