It’s been more than a week since 23-year-old Lesbia Mileth Ramirez Guerra was reported missing by her boyfriend. Investigators in Charles County, Maryland, call her disappearance “suspicious” and believe foul play was involved.

Guerra’s boyfriend reported her missing on April 2. Three days earlier, she was last seen at the Waldorf home she shares with several people, including her boyfriend, who is the father of her two children, according to the Charles County Sheriff’s Office.

During the investigation of the home on Adams Court, “Detectives identified unusual and suspicious activity at Guerra’s residence the day after she was last seen. Due to the nature of the circumstances, foul play is suspected in Guerra’s disappearance,” according to a news release from the sheriff’s office.

Detectives got a search warrant for the home, but Guerra wasn’t located. Investigators said a family SUV — a red Toyota 4Runner, with a “baby on board” sticker on the window — was at her house the day she was reported missing.

Investigators said they hope to hear from anyone who saw the red vehicle between March 31 and April 2, including in remote or isolated areas. Anyone with information is asked to contact Detective Burgess at (301) 609-6494 or submit a tip anonymously through Charles County Crime Solvers at 866-411-TIPS.

During the search of the home, investigators said they found federal documents belonging to Guerra’s boyfriend that appeared to be counterfeit. They contacted U.S. Immigration and Customs Enforcement to verify his identity — ICE said the documents were fraudulent amd he was not in the country legally. He was taken into custody.