The South Florida Sun Sentinel newsroom after the paper was awarded the Pulitzer Prize for public service for its coverage of the massacre at Marjory Stoneman Douglas High School.CreditCredit (Reuters)

The New York Times received the explanatory reporting prize for an 18-month investigation that revealed how President Donald Trump and his family avoided paying roughly half a billion dollars’ worth of taxes. The Wall Street Journal won the national reporting award for disclosing clandestine payoffs made by the president’s associates before the 2016 election to two women who had alleged affairs with Mr. Trump.

The Pittsburgh Post-Gazette won for its coverage of a gunman’s spree at the Tree of Life synagogue in October, where 11 people died. The Pulitzer board also recognized The Capital Gazette of Annapolis, Md., where five employees were killed in a shooting in June, with a special citation that included a $100,000 bequest. The Los Angeles Times won the investigative reporting prize for revealing accusations of sexual abuse against a gynecologist at the University of Southern California.