Others who spoke to the committee included Ernie Allen , the president of the National Center for Missing and Exploited Children , and Christopher J. Christie , the United States attorney for New Jersey , who led an investigation that in 2004 dismantled an Internet child pornography service stretching from Eastern Europe to Mount Laurel , N.J. Mr. Allen described tactics adopted in recent months to combat child pornography Web sites , including the creation of the Financial Coalition Against Child Pornography , a group of major financial institutions and Internet companies .