Why would anyone expect to see emergency vehicles in the pictures and videos we've seen so far?
It's a 10,000 ft (3,000 meter) runway and without flaps the plane was likely doing about 150 kts on touchdown. Where would you expect the fire trucks to be, and what are the odds they'd be visible in any given picture?
And parked (large) aircraft hide a lot of the ground in most of the images.