Red Sox spokesman Kevin Gregg said the Royals have been in town since Wednesday night and spent their off day in the city on Thursday.
The Royals are staying at the Westin Copley Place hotel, about a block from the marathon finish line.
"We've been told not to go outside. We've been told the hotel has been locked down, although I've seen a handful of people moving around," Royals vice president Mike Swanson said. "The streets are just, wow. It's numbingly quiet for a noon hour in Boston."
The Bruins also announced that the sale of playoff tickets, scheduled to start at 11 a.m. on Friday, has been put off until 11 a.m. Monday.
The New England Patriots postponed for the second time a news conference with director of player personnel Nick Caserio about next week's NFL draft. The news conference originally had been scheduled for Tuesday but was postponed after the bombings. It has been rescheduled for Monday.
Also postponed was the National Women's Soccer League game on Saturday between the Boston Breakers and FC Kansas City in Overland Park, Kan. No makeup date was announced. The decision was based on "increased security measures that have impacted travel from the area," NWSL executive director Cheryl Bailey said.
The league also said it would conduct a moment of silence before the national anthem at two games this weekend.
The bombings already have resulted in two major pro sports games in Boston getting scratched — the Bruins against the Ottawa Senators last Monday night and the Indiana Pacers against the Celtics on Tuesday night. The Bruins game was rescheduled for April 28. The Celtics game was canceled outright, and the NBA's regular season ended on Wednesday.
The Celtics are scheduled to begin the first round of the playoffs Saturday in New York against the Knicks.