WASHINGTON (Reuters) - A bicyclist was killed in downtown Washington on Monday after a crash with a police car along the motorcade route used by world leaders attending a two-day nuclear summit, officials said.

The bicyclist collided with a National Guard vehicle that was assigned to the motorcade route about halfway between the White House and the convention center where the summit is taking place.

"As a result of this collision, the bicyclist received fatal injuries," the summit's Joint Information Center said in a brief statement.

It said the accident was under investigation. A spokesman could not give further details on whether the bicycle hit the car or if the vehicle ran into the cyclist.

(Reporting by Deborah Charles)