One of the most eventful preseasons in Vikings history went from bizarre to scary on Thursday, when receiver Percy Harvin vomited, collapsed, and eventually was taken to a hospital via ambulance.

Per Judd Zulgad of the Minneapolis Star Tribune, Harvin was not participating in practice at the time. He had jogged onto the field to watch practice when he became ill.

Harvin missed several days of camp due to migraine headaches, which have affected him since he was 10 years old. Symptoms include vomiting and dizziness.

Stay tuned for more information as it becomes available.

UPDATE: The situation is being attributed to a severe migraine headache.