The two cases happened in the early hours Cambridge Road and Burnaby Road.
Man Dies After Powerboat Race Crash
A powerboat racer has died after his craft flipped over during a race in Weymouth, organisers said.
Mike Lovell, from Southampton, suffered multiple injuries in the incident on Sunday.
He was airlifted to Southampton General Hospital but race organiser P1 SuperStock confirmed he died overnight. His navigator, Dan Whapples, from Warsash near Southampton, remains in a serious but stable condition.
The pair were competing in the national powerboat racing championship in Weymouth Bay when the crash happened.
Portland Coastguard said Mr Lovell and Mr Whapples had to be rescued from the water, near Weymouth town beach and the harbour.
A spokesman for P1 SuperStock said:
''Following a powerboat incident in Weymouth yesterday, Mike Lovell and Dan Whapples both sustained serious injuries and were airlifted to Southampton General Hospital.
''Overnight Mike Lovell sadly succumbed to his injuries. Dan Whapples is in a serious but stable condition.
''A further statement will be issued when more details are available. Our thoughts are with the whole powerboat community and particularly with Mike and Dan's family and friends.''
Weymouth - the Olympic sailing venue - was hosting the first visit of the P1 SuperStock UK Championship to the Dorset coastal resort for the national powerboat series finale.
A report has been made to the Marine Accident Investigation Branch.
Many tributes have been left to Mike on the social networking site Twitter.
Lewis Hine - who has a brain tumour - posted an inspirational film about his life, on his 16th birthday last week.
One of the men's targets was Ernest Jones in Portsmouth, taking £57,000 worth of watches.
Detectives Searching For Dash Cam Footage Around Gilpin Close.
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