People.com reports that officers are looking into a possible physical altercation that could have occurred between Bobbi Kristina and boyfriend Nick Gordon.
More than a week after Bobbi Kristina Brown was found unresponsive in an Roswell, Georgia, bathtub, local officials have reportedly launched a criminal investigation into the incident, according to People.com.
Sources say that the 21-year-old's boyfriend, Nick Gordon, is the primary focus of the investigation.
"Foul play is being investigated, including drug use and possible cover up to remove evidence from the crime scene," a family source told People.
Family members have also said that Bobbi Kristina, the daughter of Whitney Houston, has undisclosed injuries "that still need to be explained." Her injuries could be indicative of a possible physical altercation between Bobbi Kristina and Gordon that occurred shortly before the incident. Sources have said that the couple has a history of violence.
"[Police are] going to follow the evidence and see where it leads us," Roswell Police Chief Rusty Grant told People.
Bobbi Kristina still remains in a medically induced coma and on life support. Doctors have reportedly told family members that the prognosis is bleak.