The city has identified the remains of four more victims of the Sept. 11 attacks, including one man whose DNA was found beneath a service road that was initially paved over, officials said Monday.

Ronald Keith Milstein's remains were found beneath the road that was built to carry cleanup and construction trucks in and out of the World Trade Center site after the 2001 terrorist attacks, the city medical examiner's office said. Milstein of Queens was 54 when he was killed.

More than 400 human bone pieces have been recovered from beneath the road, which has become known as "Haul Road" because of the hauling of debris.

Also identified was Alejandro Castano whose remains were found in the Liberty Street area, the medical examiner's office said.

The 35-year-old from Englewood, N.J., was in the area that day to deliver pens and paper to a brokerage firm on the 97th floor of the south tower, his family told The Record of Hackensack, N.J.

For now, authorities are not releasing the names of the two other victims whose remains were identified. Their families will decide whether to publicly announce the names of the 52-year-old woman identified from remains found in the former Deutsche Bank building and the 59-year-old man identified from remains discovered on Liberty Street.

The search at Haul Road began in October 2006 when utility workers found over 80 bones in a manhole in the service road. Since then, other manholes, a highway and nearby rooftops have been searched. The city identified the first victim from remains found in the road last July.

More than 1,800 of the 21,000 body parts recovered from ground zero have been found in the last two years in and around the trade center site. The remains of more than 40 percent of the 2,749 people killed at the site have yet to be identified.

The city has been using updated technology to try and re-extract DNA to make new identifications.