Brazilian football legend Pele has written on Twitter that the Brazilian Government "must make event safety and security a priority," after more than 230 people were killed in a nightclub fire in the southern city of Santa Maria.
There have been reports of safety failings at the club.
My heart goes out to all those who lost their lives in the Brazil nightclub fire and to everyone affected by such a tragedy.
So many young people are no longer with us, they had entire lives ahead of them. I ask God to protect them and take care of their families.
The Brazilian government must make event safety and security a priority in this country!
Brazil is due to host both the 2014 football World Cup and the 2016 Olympics.
Celebrations marking 500 days to the start of the World Cup were cancelled on Monday, as Brazil mourns the fire's victims.