"I don't want to get into what those reasons were," the spokesman, Peter Donald, said Sunday. "We'll be back in the morning."
Around 2 p.m. Sunday, investigators searching a basement in Manhattan's SoHo neighborhood abruptly folded up a tent they had erected to shield them from a nasty rainstorm.
Moments later, two large New York Police Department vans rolled in, obstructing most of the view of the scene. Through a small break between the vehicles, photographers were able to catch a glimpse of something being loaded into the side of an unmarked blue van.
Sunday's developments came a day after investigators discovered a possible blood stain on a concrete wall while tearing apart the basement in their search for clues in the case, a law enforcement source told CNN.
FBI agents, assisted by the NYPD, discovered the stain by spraying the chemical luminol, said the law enforcement source who has been briefed on the investigation.
The chemical can indicate the presence of blood, but is not always conclusive, according to the source. At this time, the stain is described only as an area of interest.
Investigators used chainsaws to dig out the portion of the wall with the stain, which will be sent to the FBI laboratory in Quantico, Virginia for analysis to determine whether the substance is blood and, if so, whose it is, the law enforcement source said.
The basement is about a half-block from where the boy's family still lives. Etan vanished May 25, 1979, as he walked to a bus stop by himself for the first time.
A carpenter whose former Manhattan basement is the scene of the search said through his lawyer Friday that he had no involvement in the disappearance.
Read More:http://edition.cnn.com/2012/04/22/justice/new-york-patz-probe/
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