Most sports events in Britain will proceed this weekend despite terror attacks that tore through London yesterday.
However, an Olympic celebration was called off, as was horse racing at Epsom and functions by a few Premier League soccer teams.
The Scottish Open golf tournament at Loch Lomond in Luss continued without interruption and a one-day cricket match between England and Australia in Leeds started just hours after four explosions hit the capital.
St. Andrews officials said security precautions already are in place for next week's British Open. Measures beyond that will be taken on the advice of legal authorities, the Royal and Ancient Club said.
"I'm sorry and empathetic for what happened," golfer Phil Mickelson said.
The British Grand Prix also will go ahead as planned. Practice for the auto race is today, with qualifying tomorrow and the race Sunday. The British GP has been run every year since Formula One started in 1950.
"Silverstone has a well-established set of security measures in place that have been agreed and planned in detail with police and other agencies," race organizers said. "Silverstone is confident that these measures are adequate to ensure the safety of all attending."
Celebrations were scrapped for London's winning 2012 Olympic bid.
"It would be completely inappropriate in view of this appalling tragedy," Olympics Minister Tessa Jowell said.
The evening horse race at Epsom was abandoned hours after officials had promised the schedule would proceed as usual. Course clerk Andrew Cooper cited the "escalating situation in London."
"We feel it would be inappropriate for us to race," Cooper said.
English Premier League champion Chelsea did not introduce a new player acquisition, and Arsenal called off a ceremony for its new stadium.
-- From News Services