John Wesley Mosley Jr., 65, of the 700 block of Essex Avenue, had been arguing with his neighbor Tuesday morning just before the fire was reported, police said.
The neighbor said she was calling police when she heard a loud noise, then saw fire and windows shattering, according to the report.
After being rescued by a neighbor and police officer, the woman was taken to Johns Hopkins Bayview, where police said she was expected to survive.
Police executed a search warrant at Mosley's home Tuesday to investigate whether an incendiary device was involved and did not find one, the report stated.
An accelerant-sniffing dog had a positive reaction near the scene of the blaze, leading investigators to believe that an accelerant was used to start the fire, police said.
Mosley and the victim had been neighbors for "many years, with no history of trouble," according to police.
Twice in the last month, officers were called to investigate suspicious circumstances that involved Mosley, who refused to talk to police when they arrived, the report stated.
Witnesses, including the victim, said Mosley had been yelling outside his house and acting strangely lately, according to police.
Baltimore County Police Department's Mobile Crisis Unit, which handles situations that may involve crisis or mental illness, responded to Mosley's home on Feb. 2, police said. In the past, officers have sent Mosley for emergency evaluations twice, in 1995 and 1996. An emergency evaluation can be made if the person has a mental disorder and presents danger to the life and safety of others.
Mosley was charged Tuesday with attempted first degree murder, first-degree arson and first-degree assault. He was being held at the Baltimore County Detention Center without bail, police said.