It crashed and landed on its side near the bank of the River Thames at Mapledurham.
Henley Chemical Incident Not Terror
Thames Valley Police say there's nothing to suggest a so-called "chemical incident" in Henley was terror-related.
People came out of WH Smith on Bell Street coughing with streaming eyes around 2pm on Wednesday afternoon.
The town centre was effectively put into lockdown with all roads in and out cordoned off as fire crews investigated what had happened.
A vigil will be held in Oxford tonight for the victims and their families after Wednesday's attack in Westminster.
hames Valley Police is reviewing security after yesterday's terror attack in London.
Thames Water is set to be fined for polluting the Thames with 1.4 billion litres of raw sewage.
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