A man tries to attract a bull's attention during a running of the bulls event of a festival in Huamantla, Tlaxcala, Mexico, Aug. 18, 2018. (Xinhua/Xin Yuewei)

A man tries to attract a bull's attention during a running of the bulls event of a festival in Huamantla, Tlaxcala, Mexico, Aug. 18, 2018. (Xinhua/Xin Yuewei)

An injured man is transfered to hospital during a running of the bulls event of a festival in Huamantla, Tlaxcala, Mexico, Aug. 18, 2018. (Xinhua/Xin Yuewei)

A man tries to attract a bull's attention during a running of the bulls event of a festival in Huamantla, Tlaxcala, Mexico, Aug. 18, 2018. (Xinhua/Xin Yuewei)

A man tries to attract a bull's attention during a running of the bulls event of a festival in Huamantla, Tlaxcala, Mexico, Aug. 18, 2018. (Xinhua/Xin Yuewei)

A bull reacts during a running of the bulls event of a festival in Huamantla, Tlaxcala, Mexico, Aug. 18, 2018. (Xinhua/Xin Yuewei)

A man tries to attract a bull's attention during a running of the bulls event of a festival in Huamantla, Tlaxcala, Mexico, Aug. 18, 2018. (Xinhua/Xin Yuewei)

A bull is seen during a running of the bulls event of a festival in Huamantla, Tlaxcala, Mexico, Aug. 18, 2018. (Xinhua/Xin Yuewei)