Missouri Governor Jay Nixon has decided not to attend today's funeral of Michael Brown "out of respect for the family".
A spokesman for the governor said relatives "deserve time to focus on remembering Michael and grieving their loss".
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A weather warning is also in place for Scotland, which could see "treacherous" and blizzard-like conditions on Thursday.
The lorry lost several butane gas canisters as the driver rammed into cars in a dangerous escape attempt that was ended by police gunfire.
The Gambling Commission said: "Integrity in sport is not a joke and we have opened an investigation to establish exactly what happened."