The upper level of a huge float collapsed during the second night of Rio de Janeiro's world famous carnival parade, injuring at least 12 people – the second serious accident to hit the world-famous street party in 24 hours.

The latest incident involved a float of the popular samba school Unidos da Tijuca, themed around Mardi Gras in New Orleans. Revellers cried on the pavement and in the stands as injured people were removed by rescuers.

Rio de Janeiro Carnival 2017 Unidos da Tijuca
Firefighters (top) assist a reveller of the Unidos da Tijuca samba school after the third floor of a float collapsedVanderlei Almeida/AFP
Rio de Janeiro Carnival 2017 Unidos da Tijuca
A reveller is assisted after an accident with a float from Unidos da Tijuca samba schoolPilar Olivares/Reuters
Rio de Janeiro Carnival 2017 Unidos da Tijuca
Vanderlei Almeida/AFP
Rio de Janeiro Carnival 2017 Unidos da Tijuca
Pilar Olivares/Reuters

Ailton Freitas, a director at Unidos da Tijuca, said their floats had been tested repeatedly before the carnival. "We tested three times a week with more weight than we carried today. When the parade approached we started doing those tests every day. We are even more shocked than you all are," Freitas told journalists. "I don't know what is happening, but Rio's Carnival is not being blessed this year."

Minutes earlier a smaller incident happened with samba school Mocidade Independente. A platform detached from their fourth float and dropped a reveller to the ground. The samba school said she was not injured.

Police are investigating the cause of the accident. Rio City hall said two people were in serious condition. One suffered a head trauma, according to one doctor. The parade had to be stopped for almost 25 minutes so the injured could get medical attention. The show was allowed to proceed. IBTimes UK presents photos of each the samba schools' carnival parades.

Unidos da Tijuca samba school:

Rio de Janeiro Carnival 2017 Unidos da Tijuca
Pilar Olivares/Reuters
Rio de Janeiro Carnival 2017 Unidos da Tijuca
Vanderlei Almeida/AFP
Rio de Janeiro Carnival 2017 Unidos da Tijuca
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Unidos da Tijuca
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Unidos da Tijuca
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Unidos da Tijuca
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Unidos da Tijuca
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Unidos da Tijuca
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Unidos da Tijuca
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Unidos da Tijuca
Ricardo Moraes/Reuters

Portela samba school:

Rio de Janeiro Carnival 2017 Portela
Ricardo Moraes/Reuters
Rio de Janeiro Carnival 2017 Portela
Ricardo Moraes/Reuters
Rio de Janeiro Carnival 2017 Portela
Vanderlei Almeida/AFP
Rio de Janeiro Carnival 2017 Portela
Ricardo Moraes/Reuters
Rio de Janeiro Carnival 2017 Portela
Vanderlei Almeida/AFP
Rio de Janeiro Carnival 2017 Portela
Pilar Olivares/Reuters
Rio de Janeiro Carnival 2017 Portela
Ricardo Moraes/Reuters
Rio de Janeiro Carnival 2017 Portela
Pilar Olivares/Reuters

Mocidade samba school:

Rio de Janeiro Carnival 2017 Mocidade
Pilar Olivares/Reuters
Rio de Janeiro Carnival 2017 Mocidade
Pilar Olivares/Reuters
Rio de Janeiro Carnival 2017 Mocidade
Pilar Olivares/Reuters
Rio de Janeiro Carnival 2017 Mocidade
Sergio Moraes/Reuters
Rio de Janeiro Carnival 2017 Mocidade
Sergio Moraes/Reuters
Rio de Janeiro Carnival 2017 Mocidade
Sergio Moraes/Reuters
Rio de Janeiro Carnival 2017 Mocidade
Sergio Moraes/Reuters
Rio de Janeiro Carnival 2017 Mocidade
Pilar Olivares/Reuters
Rio de Janeiro Carnival 2017 Mocidade
Sergio Moraes/Reuters
Rio de Janeiro Carnival 2017 Mocidade
Sergio Moraes/Reuters
Rio de Janeiro Carnival 2017 Mocidade
Ricardo Moraes/Reuters
Rio de Janeiro Carnival 2017 Mocidade
Former Brazilian football player Ronaldinho performs with the Mocidade Independente de Padre Miguel samba schoolVanderlei Almeida/AFP

Uniao da Ilha samba school:

Rio de Janeiro Carnival 2017 Uniao da Ilha
Pilar Olivares/Reuters
Rio de Janeiro Carnival 2017 Uniao da Ilha
Pilar Olivares/Reuters
Rio de Janeiro Carnival 2017 Uniao da Ilha
Sergio Moraes/Reuters
Rio de Janeiro Carnival 2017 Uniao da Ilha
Sergio Moraes/Reuters
Rio de Janeiro Carnival 2017 Uniao da Ilha
Sergio Moraes/Reuters
Rio de Janeiro Carnival 2017 Uniao da Ilha
Sergio Moraes/Reuters
Rio de Janeiro Carnival 2017 Uniao da Ilha
Pilar Olivares/Reuters

Sao Clemente samba school:

Rio de Janeiro Carnival 2017 Sao Clemente
Pilar Olivares/Reuters
Rio de Janeiro Carnival 2017 Sao Clemente
Pilar Olivares/Reuters
Rio de Janeiro Carnival 2017 Sao Clemente
Sergio Moraes/Reuters
Rio de Janeiro Carnival 2017 Sao Clemente
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Sao Clemente
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Sao Clemente
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Sao Clemente
Yasuyoshi Chiba/AFP

Mangueira samba school:

Rio de Janeiro Carnival 2017 Mangueira
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Mangueira
Ricardo Moraes/Reuters
Rio de Janeiro Carnival 2017 Mangueira
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Mangueira
Pilar Olivares/Reuters
Rio de Janeiro Carnival 2017 Mangueira
Pilar Olivares/Reuters
Rio de Janeiro Carnival 2017 Mangueira
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Mangueira
Yasuyoshi Chiba/AFP
Rio de Janeiro Carnival 2017 Mangueira
Pilar Olivares/Reuters

Just one night earlier, a float belonging to samba school Paraiso de Tuiuti crashed and injured at least 20 people, including three seriously. Following that accident, organisers also decided to proceed with the show.