(NewsNation) — Florida resident Ana Knezevich has been missing in Spain since early February.

A new report claims authorities found biological remains in her apartment. However, Knezevich’s brother, Felipe Henao, says the FBI told him that the report is not true.

“We want to know the truth. We want to know where my sister is,” said Henao, a guest of NewsNation’s “Cuomo” on Wednesday. “If anyone has any information, any tips, please reach out to the FBI or the Spanish authorities.

FBI investigators “don’t want to share any information, because it could jeopardize the case. I understand. Justice moves slow,” Henao said.

Knezevich, a resident of Florida, went missing at the beginning of February. She disappeared while visiting Madrid. The disappearance occurred the same night as an unidentified individual was spotted vandalizing security cameras, further complicating the investigation into Knezevich’s disappearance.

Knezevich had traveled to Madrid as part of her efforts to cope with a recent divorce and to gather her thoughts. She had plans to continue her journey to Barcelona with a friend, but she failed to arrive at the designated train station. Concerns escalated when Spanish authorities found no evidence of robbery during a search of her apartment.

Adding to the mystery are text messages purportedly sent from Knezevich’s phone, indicating that she had met someone after therapy and intended to visit his house. However, friends and family members doubt the authenticity of these messages, citing inconsistencies in language and tone that suggest they were not authored by Knezevich herself.