Seven officers were injured in Bristol, where violence broke out and bins were set alight.
Officials said it appeared the victims had been shot dead, then the vehicles set alight.
Police believe Mrs Crown, a widow, was set alight in an attempt to destroy evidence.
All three were set alight and hanged, the court in Uttar Pradesh state heard.
The leaves on the trees have begun to smoulder, not yet set alight with full autumn colour.
In 2007, protesters set alight dozens of petrol stations after the system of fuel rationing was introduced.
The trial heard petrol was poured through the letterbox of the property before it was set alight.
Vehicles belonging to Mr Trodden's company JTS Civil Engineers have been set alight on four previous occasions.
An extra 1, 700 police officers were deployed in London, where shops were looted and buildings were set alight.
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Her clothes had been set alight but the fire did not spread to the rest of the bungalow.
Officers believe an object had been set alight under one of the vehicles.
And far away towards Knaphill I saw the flashes of trees and hedges and wooden buildings suddenly set alight.
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Speed cameras have regularly been set alight in the region, with at least 19 set on fire since 2004.
There was unrest in cities including Manchester, Salford, Liverpool, Nottingham and Birmingham, with shops being looted and set alight.
The airfield's four fire appliances made their way to the site (nearby fuel pits had also been set alight).
Martin Francis was at home in Tower Way on Saturday morning when police told him his car had been set alight.
Elsewhere in Leeds, a van was set alight during disorder in the Roundhay Road area of Harehills, late on Tuesday night.
Residents said the mosque set alight was close to the town's market, a sprawling bazaar important to local trade in northern Myanmar.
Bins and rubbish were pulled onto Leckey Road flyover and set alight.
The car in Avondale was set alight at 07:00 GMT on Saturday.
Fire chiefs say an extended dry spell has left vegetation around Cleator Moor, Maryport, and Whitehaven excessively dry and easy to set alight.
Some time between 18:00 GMT and 19:00 GMT on Thursday, an electrical substation on a windfarm on the Ballyconnell Road, was set alight.
Forensic expert Anne Ramage told the court that he may still have been alive when he was doused in petrol and set alight.
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Cars were damaged and set alight during disturbances involving the youths in Chatham and Gillingham on Monday and in the early hours of Tuesday.
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Thames Valley Police said an officer driving past the site saw the blaze and a number of gas canisters appeared to have been set alight.
The violence was allegedly sparked by a quarrel between a Muslim man and Buddhist woman that ended with the woman doused in petrol and set alight.
"In two of the incidents the fires caught on, one of them set alight a nearby garage, the other caught on to a house, " he said.
From the moment the first rock was thrown and car set alight, Indonesians suspected the riots were more than a spontaneous uprising against an overstaying president.
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