Australian golfer Robert Allenby leads countryman Adam Scott and three others after the second round of the Booz Allen Classic tournament in suburban Washington, D-C.

Allenby fired a 6-under-par 65 in the second round and is 9-under-par, 133 for the tournament.

Adam Scott shot a 4-under-par 67 and is tied with first round leader Matt Gogel and Steve Elkington of the United States and England's Lee Westwood at 7-under-par 135.

Two-time U-S Open champion Ernie Els of South Africa is part of a group of golfers three strokes off the lead at 6-under-par 136. Els won the U.S. Open on the Congressional Course in 1997. World number one golfer Vijay Singh of Fiji shot a 2-under-par 69 and is in a tie for 43rd place at 2-under-par 140.

The tournament is being played on the 6,581-meter, par-71 Congressional Country Club, Blue Course. It is a key warm-up for the second major tournament of the year, the U.S. Open, next week in Pinehurst.

Some information for this report provided by AP