A U.S. Justice Department report says Arlington County police have improved their operations to be better able to respond to a terrorist attack.

The county has stepped up its training for critical incidents, and now prepares officers for active-shooter incidents, hazardous materials and other forms of terrorist attacks., the report said. The changes have been made since the Sept. 11, 2001, terrorist attacks, which included a hijacked American Airlines jet crashing into the Pentagon, killing 189 people.