I hope it is not too serious.
The number of emergency vehicles responding is not any indication of the severity of the incident, nowadays.
We had a simple incident at our field recently land despite asking for an ambulance and single fire engine only, we ended up with no less than thirteen emergency vehicles, including a helicopter, and the police declaring an 'exclusion zone', courtesy of an 'incident commander' based 150 miles away. Slight over reaction...
So perhaps this may be no worse than ours, which involved minor injury for one person only. Fingers crossed.