SAN DIEGO (AP) — Nearly two weeks after a 7-year-old girl disappeared, police again searched the home of a neighbor they have called a potential suspect in the case.

Detectives, who spent more than five hours at the home of David Westerfield on Wednesday night, carried out several boxes and other items but declined to say if they had uncovered anything important.

Westerfield, who lives two doors down from the van Dam family, has had his home searched several times and has given authorities a DNA sample that was sent to an FBI crime lab for analysis. Police have also seized the 49-year-old self-employed engineer's motor home.

Danielle van Dam was last seen Feb. 1 when her father put her to bed in the family's home 20 miles north of downtown. No one has been arrested in the case and police said as recently as Tuesday that their case was progressing slowly.

The girl's parents said they would hold a news conference Thursday in front of their home. They have offered a $25,000 reward for information leading to their daughter's safe return.

On Tuesday, investigators used a bloodhound to search the van Dam home, saying they hoped the dog might be able to turn up any clues they had missed in previous searches. They have not said if they found anything.

Marc Klaas, who became an advocate for missing children after his daughter was murdered in 1993, met with the van Dam family Wednesday to "help them deal with this a little bit," he said.

"I can emotionally give them support and tell them what to expect," Klaas told reporters after meeting with Danielle's parents.

Klaas's 12-year-old daughter, Polly, was abducted from her home in Petaluma during a slumber party. Her body was found 65 days later. Richard Allen Davis was later convicted and sentenced to death for the crime.