Editor's Note: This article originally appeared on Business Insider.

The US Army has announced that partial human remains were found in an area of Texas being investigated in the search for US Army Pfc. Vanessa Guillen, the missing soldier stationed at Fort Hood.

It was unclear whose remains were found, the US Army Criminal Investigation Command said in a statement to Insider. Army investigators said they found the partial human remains after they “returned to an area of interest” near the Leon River in central Texas.

The remains were analyzed by a forensic anthropologist, who discovered their human origin.

“No confirmation as to the identity of the remains has been made at this point and we ask for the media and public's understanding that the identification process can take time,” the Army Criminal Investigation Command said in its statement.

Other law-enforcement officials, including the Texas Rangers, the FBI, and the Bell County Sheriff's Department, were on the scene.

Guillen, a 20-year-old Houston native, was last seen at Fort Hood on April 22. Following her disappearance, investigators found the keys to her car and room along with other identification cards in the armory where she worked on that same day.

Democratic Rep. Sylvia García, a House lawmaker who represents Guillen's district, said last week that the Army believed “that there is foul play involved.”

More than 150 people were interviewed during the investigation, which spanned multiple law-enforcement agencies and nonprofit groups.

Guillen's sister, Mayra, said Guillen had alleged that she had been sexually harassed by a superior. The Army, however, said it had “no credible information or report.”

Related: Here's everything we know about Vanessa Guillen, the soldier who disappeared from Fort Hood two months ago

“We are completely committed to finding Vanessa and aggressively going after every single piece of credible information and every lead in this investigation,” a Criminal Investigation Division representative, Chris Grey, said in a statement. “We will not stop until we find Vanessa.”

“We know somebody out there has some very critical information pertaining to this investigation and we strongly encourage you to do the right thing and come forward,” Grey added. “Do it for Vanessa and do it for her family, friends, and fellow soldiers.”

The Army has offered a $25,000 reward for information leading to the whereabouts of Guillen.

The discovery of the human remains comes over a week after the remains of another Fort Hood soldier were found in Texas. The skeletal remains of Pvt. Gregory Morales, a 24-year-old Oklahoma native, were found June 19 and identified the next day. He was last seen August 19.

Investigators have not found a connection between the disappearance of Morales and Guillen.

More from Business Insider: