Five children under age 10 and their mother were fatally shot inside a Wilmington home this morning, according to the Los Angeles Police Department.

Police said that the assailant appeared to be the children's father and that he apparently committed suicide after faxing a letter to KABC Channel 7. Channel 7 then contacted authorities, police said.

The LAPD was dispatched to the 1000 block of McFarland Avenue at 8:22 a.m. Officer Sam Park said the man apparently committed suicide.

"He called 911 and said his family was dead inside," Park said. "We responded. We have multiple victims inside of the house, and at this point we don't know how many."

Updated at 10:30 a.m.: Police said the children were an 8-year-old girl, twin 5-year-old girls and twin  2-year-old boys. Deputy Chief Kenneth Garner said police found notes inside the house in which the gunman referred to "work-related issues."

"This was a financial- and job-related issue that led to the slayings," Garner said. "In these tough economic times, there are other options. In my 32 years, I've never seen anything like this."

Updated at 11:25 a.m. Someone called the LAPD about 8:20 a.m. saying, "I just returned home, and my whole family has been shot," according to Garner. Police entered the house and smelled gunshot residue. The bodies were found around the house and had been shot with a revolver. Garner said the bodies of the three girls were found in an upstairs bedroom and the bodies of the boys and the mother were found in a back bedroom. Notes found at the house suggested the case was a murder-suicide, he said.

According to Channel 7, the faxed letter detailed workplace problems both the man and his wife were having at a Kaiser Permanente hospital in West Los Angeles. The letter said that an unnamed administrator told him one day that he shouldn't have come to work and said "you should have blown your brains out." The man said in the letter that he complained to his union to no avail. Then both he and wife were fired, Channel 7 reporter Gene Gleeson said in summarizing the letter.