More than 400 lawsuits were filed across New York state against the Catholic Church, the Boy Scouts and other institutions Wednesday to mark the first day of a one-year window to file historic claims of child sex abuse—and plaintiffs attorneys said many more cases are in the pipeline.

Some 169 cases had been filed under the Child Victims Act in the five counties of New York City as of 5 p.m. Wednesday, according to a search of the New York State Court Electronic Filings system, a court records database. The Archdiocese of New York and other Catholic institutions were the defendants in the vast majority of them. Most suits were filed by a single plaintiff, but in some instances, more than a dozen victims sued together.