Officials at Oxford university had to close a party down when a student turned up with his home made flame thrower.
Inigo Lapwood, 20, said he made the weapon using parts from a nail gun and diesel engine glow plug and a canister of butane gas.
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Saturday morning's weather for the east of the region
Saturday morning's weather for the west of the region
Oxford's most famous hotel, the Randolph, is ablaze after a fire started in the roof space. 12 fire crews are on location in the city.