There has been a fire on a bus inbetween Hatfield and St Albans.
It took place on Albatross Way near the University of Hertfordshire's de Havilland Campus and is still causing traffic delays in the area.
Unobus says it's not using this Herts Uni entrance and advises its customers to use the front entrance in Mosquito Way instead.
Crews from Hatfield and St Albans fire arrived at the scene around 11.30am and crews started damping down at 12.15pm.
Rebecca O'Grady Hartley said she watched the fire being put out with other onlookers.
"There was a loud explosion just after I took the first few pictures," Rebecca told this newspaper.
"I'd turned around to leave and I assume the fuel exploded. Very loud and shocking.
"It drew quite a few people from the nearby houses".
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