People participate in the Rolling Thunder motorcycle ride in Washington, D.C., the United States, on May 30, 2021. Motorcyclists descended on the nation's capital on Sunday to join the annual Rolling Thunder motorcycle ride to commemorate the Memorial Day. (Photos: Xinhua/Liu Jie)

A motorcyclist participates in the Rolling Thunder motorcycle ride in Washington, D.C., the United States, on May 30, 2021. Motorcyclists descended on the nation's capital on Sunday to join the annual Rolling Thunder motorcycle ride to commemorate the Memorial Day.

People participate in the Rolling Thunder motorcycle ride in Washington, D.C., the United States, on May 30, 2021. Motorcyclists descended on the nation's capital on Sunday to join the annual Rolling Thunder motorcycle ride to commemorate the Memorial Day.

People participate in the Rolling Thunder motorcycle ride in Washington, D.C., the United States, on May 30, 2021. Motorcyclists descended on the nation's capital on Sunday to join the annual Rolling Thunder motorcycle ride to commemorate the Memorial Day.

A motorcyclist participates in the Rolling Thunder motorcycle ride in Washington, D.C., the United States, on May 30, 2021. Motorcyclists descended on the nation's capital on Sunday to join the annual Rolling Thunder motorcycle ride to commemorate the Memorial Day.

People participate in the Rolling Thunder motorcycle ride in Washington, D.C., the United States, on May 30, 2021. Motorcyclists descended on the nation's capital on Sunday to join the annual Rolling Thunder motorcycle ride to commemorate the Memorial Day.