The New York Times has sued the New York Police Department, saying the department had routinely violated a state law that requires government agencies to provide information to the press and the public.

In a lawsuit filed on Tuesday in State Supreme Court in Manhattan, The Times described four requests made by reporters this year for information that it said the police had delayed or denied. The Times said the department’s handling of the requests reflected a pattern and practice by which the police avoided providing material that the State Freedom of Information Law said must be released.

“We’ve become increasingly concerned over the last two years about a growing lack of transparency at the N.Y.P.D.,” said David E. McCraw, a vice president and assistant general counsel of The New York Times Company. “Information that was once released is now withheld. Disclosures that could be made quickly are put on hold for months.”

“The police have performed outstanding service to this city,” Mr. McCraw added, “but it’s important that they also meet their duties under the Freedom of Information Law. People have a right to know what public agencies are doing, and how they are doing it, so that there can be an informed public debate over what policies are pursued and how tax dollars are spent.”