Rescue helicopter crashes off Rio's Copacabana beach
1 January 2013 Last updated at 09:13 GMT
Dramatic footage has emerged of the moment a rescue helicopter plunged into the sea at Copacabana beach in Rio de Janeiro during an attempt to help a swimmer who was in trouble.
The video was taken by a Brazilian tourist - one of hundreds of beach-goers who witnessed the drama.
David Petale reports.