Mounted police patrol the Tidal Basin during peak bloom of Yoshino cherry trees in Washington DC, April 11, 2015. The 2015 National Cherry Blossom Festival is underway with blossoms currently in peak bloom. The festival commemorates the 1912 gift of three thousand cherry trees from Mayor Yukio Ozaki of Tokyo to the city of Washington DC. [Photo by Wang Yu/chinadaily.com.cn]