Police investigating the slayings of six people whose bodies were found in a blood-spattered Florida house questioned two men Saturday.

Investigators described the two men as "persons of interest" but not suspects in the deaths of four men and two women whose remains were found in different rooms of a three-bedroom home in Deltona (search), about 25 miles north of Orlando.

Sheriff Ben Johnson said one man being held on a probation violation "had some knowledge of some of the victims." The other man agreed to accompany detectives. The sheriff described the two as "somewhat" cooperative.

Authorities have not offered a motive or disclosed how the victims died, although the sheriff said the crime scene was "very, very brutal."

The victims ranged in age from 18 to mid-30s and did not appear to be related.

The bodies were discovered after one victim's co-worker at Burger King (search) called a friend and asked the person to visit the home because the victim had not arrived for work, officials said.

The sheriff's office on Saturday identified the victims as Michelle Ann Nathan, 19; Anthony Vega, 34; Roberto "Tito" Gonzalez, 28, of New York; Francisco Ayo Roman, 30; and Jonathan Gleason, 18. Authorities had not yet positively identified the sixth victim by late Saturday.

Forensic experts also began to examine blood stains at the house. There was so much blood to analyze that the task could take up to 18 hours, sheriff's spokesman Brandon Haught said.

The killing spree in the working-class, bedroom community of more than 70,000 people was the deadliest in Florida since 1990, when a man whose car was repossessed shot eight people to death at a Jacksonville (search) loan office before turning the gun on himself.

Outside the house, rain thinned the numbers of neighbors and relatives who had gathered a day earlier. Beside a bouquet of white roses, one person left a note that read: "There really are monsters among us."