Sichuan Qingchuan 6.4 Magnitude Aftershock Video from the Earthquake on May 25 at 16:21

At around 4:21 PM today, a 6.4 magnitude aftershock occurred in the Qingchuan area of Sichuan. Chengdu experienced a prolonged and noticeable tremor, while Mianyang also felt strong shaking. People quickly ran out of buildings. At 4:21 PM, a 6.4 magnitude aftershock occurred in the Qingchuan area of Sichuan. There was significant swaying in high-rise buildings in Chengdu. The aftershock lasted for over a minute, and there is still some slight swaying in the buildings now.

Video and photos from the scene are available in detail.

(Note: This translation provides a coherent and fluent version of the provided Chinese text. If you need any specific part translated differently or more elaborately, please let me know!)