Washington (CNN) -- Authorities investigating why a Connecticut woman rammed barricades near the U.S. Capitol found medications in her apartment to treat schizophrenia and other mental disorders, a law enforcement source briefed on the investigation said Friday.
The woman, identified by law enforcement officials as Miriam Carey, 34, was shot dead Thursday.
Investigators searched for clues at the woman's Stamford, Connecticut, home beginning Thursday, law enforcement sources said. Police and bomb squad units surrounded an apartment complex there and the area remained cordoned off Friday morning.
Other investigators pressed to speak with the woman's relatives in Brooklyn, New York, but were turned away, federal law enforcement sources told CNN.
History of concerns
Carey's boyfriend contacted police in December saying he feared for the safety of their child, who was 4 months old at the time, according to a law enforcement source involved in the investigation. The boyfriend said the woman was acting delusional, claiming the president had placed Stamford under lockdown and that her house was under electronic surveillance, the source said.
He told police that she was suffering from post-partum depression, was having trouble sleeping and was on medication. Carey underwent a mental health evaluation, said the source, who added that the boyfriend has been question by federal authorities about Thursday's events.
The source told CNN that Carey left a letter addressed to the boyfriend at her apartment and that it appeared to contain white powder. The letter is being tested for hazardous substances.
Federal and local law enforcement agents evacuated Carey's neighborhood Thursday before searching her apartment in the evening, the source said. Authorities checked her residence for explosives before entering, but none were found.