Federal and local law-enforcement agencies converged on Washington’s Navy Yard late Sunday after reports of gunfire and large-scale disorder less than a mile from the U.S. Capitol. Witnesses described a crowd of more than 100 youths riding dirt bikes and setting off fireworks in a park before shots were heard. The FBI, Department of Homeland Security and Homeland Security Investigations joined District police at the scene. Authorities did not immediately report casualties or announce arrests. Shortly afterward, multiple fights broke out outside the Yotel Hotel on New Jersey Avenue NW, prompting another deployment of FBI and other federal personnel. Several individuals were detained, according to on-scene accounts, though officials have yet to confirm whether the brawls were linked to the earlier disturbance. The overnight unrest comes amid renewed scrutiny of public-safety trends in the nation’s capital. Metropolitan Police data list nearly 1,600 violent crimes and more than 15,000 total offenses so far this year, figures that critics cite in questioning assertions that overall crime is falling. Investigations into the latest incidents are ongoing.