SAN DIEGO -- San Diego police investigators announced Friday that the blood of missing 7-year-old Danielle van Dam was found on an article of clothing owned by neighbor David A. Westerfield, 10News reported.

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Westerfield, 49, lives just two doors down from the van Dam family's Sabre Springs home, and was arrested at his attorney's office in Golden Hill shortly after 10:45 a.m. Friday.

WESTERFIELD ARREST See Westerfield Being Arrested Westerfield Didn't Know Arrest Was Coming

Westerfield, wearing a green polo shirt and sunglasses, was placed in the back seat of an unmarked police car before being driven away by authorities.

At a press conference Friday, San Diego Police Department Chief David Bejarano told reporters that Westerfield had been arrested on charges of kidnapping, and that more charges could be issued.

"We believe without a question that the DNA evidence links Mr. Westerfield to Danielle's disappearance," Bejarano said.

"Danielle's blood was found in an article of clothing which belongs to Mr. Westerfield and also in his motorhome," Bejarano said. "The analysis of these blood sources was conducted here in our lab and it's a real methodical, complex procedure -- requiring hours and days of processing."

He called the DNA evidence "a very, very strong link" between the divorced father of two and the missing 7-year-old girl.

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Watch The Police Press Conference The Investigation Continues

"We've obviously had a number of conversations with Mr. Westerfield over the last couple of weeks, but we're not aware of a motive at this point," Bejarano (pictured, right) said.

Westerfield was booked into the county jail around 3:30 p.m., and is expected to be arraigned in Superior Court some time Tuesday. Because of special circumstances, he is being held without bail.

"There still is much investigation to do and evidence analysis to complete. Investigators will continue following any leads that might take us to Danielle," a police statement said.

Investigators have focused much of their efforts on Westerfield, who took his recreational vehicle to an area near Glamis for the weekend on the same morning Danielle was reported missing.

Investigators had searched his home several times, and impounded his sport utility vehicle and motor home.

Investigators took some 13 bags of evidence from Westerfield's home about a week after the girl disappeared. Among those bags of evidence were materials that appeared to be child pornography, according to 10News.

Danielle was first reported missing Feb. 2. Her father, Damon van Dam, told authorities that the last he'd seen of his daughter was when he had put her to bed after 10 p.m. the night before.

On that night, Brenda van Dam had gone out with several female friends and came home around 2:30 a.m. She then stayed up for about an hour with her husband and friends, according to 10News.

She said she made sure the childrens' bedroom doors were closed to keep from disturbing them, but didn't check on the children. Danielle has two brothers.

Westerfield previously told reporters that he saw Brenda van Dam at a bar near their home the night before Danielle was reported missing. The design engineer told 10News that he danced with his neighbor; she later denied that story.

Since then, the case has drawn national media attention and drawn hundreds of people, including a group of Miramar Marines, into searches of the desert and various rural areas in San Diego County.

'We Will Keep Searching'

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Shortly after the arrest, Danielle's mother told reporters that while she was encouraged by Westerfield's arrest, "the fact still remains that we don't have our daughter."

"We will keep searching," she said.

San Diego Mayor Dick Murphy echoed the sentiment, saying he holds out hope that Sabre Springs second-grader Danielle van Dam will be found alive.

"On behalf of all San Diegans, our hearts and prayers go out to the van Dam family," Murphy said. "We are all still hopeful that Danielle will be safely returned to her family."

A statement from San Diego police Friday said: "Detectives continue to follow information that might lead them to the missing girl. The department still holds out hope that she will be found alive, but the evidence indicates that the chances of that have diminished."

Friday's search was focused on the Skyline area of East County, along Lyons Valley Road, said Fiona Oberrick, deputy director of the Danielle Recovery Center.

"The search areas don't have any significance as far as any of today's developments," she added.

Fewer than 10 volunteers were working in the center on clerical activities Friday, Oberrick said, and about 20 were in the field.

"We still need volunteers," Oberrick said. "This doesn't change anything. We'll search every day."

Investigators extended their search to Mexico Thursday. Investigators searched a house in Tijuana after a Mexican woman reported that she had seen a girl resembling Danielle.

"Detectives were in Mexico today following up on one of the 500+ tips we have received," wrote David Cohen, of the SDPD, in an e-mail to reporters. "There is no word that she has been found."

Cohen also answered recent Internet speculation about extending the search to the Coronado area. Westerfield had spent an evening at Silver Strand State Park before heading to the desert on the weekend that Danielle was first discovered missing.

He apparently only stayed at that beach-camping spot south of Coronado for a few hours before heading into the Imperial County desert, where he spent much of the weekend of Feb. 2-3.

"Members of the (SDPD) horse patrol and from the Chula Vista Police Department's mounted reserve unit were on the Silver Strand today, searching for any sign of Danielle. Nothing of significance was located," Cohen wrote.

Closer to the van Dam family's northern San Diego home, more than 30 Marines from Marine Corps Air Station Miramar looked for clues to the missing girl's disappearance in the brushy foothills off Highway 67 in the vicinity of Poway and Lakeside.

Organizers at the Poway-based Danielle Recovery Center are also planning a third weekend of searches in the desert, one in Borego Springs and one in Shelter Valley.

Meanwhile, a candlelight vigil in honor of Danielle was held at St. Timothy's Episcopal Church in Rancho Penasquitos Thursday night.

About 75 people attended the service at the Episcopal church, including some of Danielle's classmates.

"It's overwhelming right now," Brenda van Dam said. "I mean I'm on the verge of crying. It's just overwhelming. We have a wonderful community and everybody's helping us the best we can."

Friday evening, concerned citizens will join SDPD officials at a "town hall" meeting featuring a talk by Marc Klaas of Petaluma, whose own young daughter was abducted and murdered in 1993. That gathering will take place at Creekside Elementary, where Danielle attended second grade.