WASHINGTON, March 3 (Reuters) - The Federal Aviation

Administration said it is investigating after several flight

crews on Saturday received faulty alerts of potentially nearby

aircraft on arrival at Washington's Reagan National Airport.

The FAA said Monday that some of the crews executed

go-arounds as a result of the alerts and is investigating why

the alerts occurred. There has been intense focus on traffic at

the airport after a Jan. 29 fatal collision between an Army

helicopter and American Airlines ( AAL ) regional jet near the

airport killed 67 people.