A child was hospitalized after being hit by one of several drones that crashed into each other during a Saturday night aerial holiday show in Orlando.

The boy underwent hours of open-heart surgery Sunday after the drone struck his chest with such force that it damaged one of his heart valves, Edgerton said. “The blade cut his mouth, but there’s an actual imprint of the drone on his chest,” she said.

A 7-year-old at a holiday drone show in Orlando, Florida, was injured Saturday night when one of the drones crashed and fell onto the crowd, and struck him in the chest, his mother said. Adriana Edgerton told NBC affiliate WESH that her son,

A 7-year-old boy underwent open-heart surgery after several drones crashed, with one of the devices striking his chest during the third annual Holiday Drone Show at Lake Eola Park in Orlando, Florida,