NEW YORK (AP) — The chief operating officer of the National Children's Museum in Washington was arrested Tuesday on child pornography charges, accused of using his work computer to send explicit images to others — including an undercover New York City detective.

Robert A. Singer, 49, was arrested at his home in Falls Church, Va., on charges that he sent the pornographic images to a detective posing as a 33-year-old mother and her 12-year-old daughter, U.S. Attorney Michael Garcia said.

Singer was identified in the criminal complaint as a spokesman for the Capital Children's Museum, which closed in September 2004 to prepare for renovations. The museum, which plans to reopen in 2012 as the National Children's Museum, said in a statement that officials were "horrified" by the events.