More than 24 feared dead as two multi-storey buildings collapse after explosion in centre of Rio

-Buildings in city centre were 20 storeys and 10 storeys high

-Collapse at 8pm left rubble strewn over wide area

-Third building annexed to historic Municipal Theatre also damaged

-Officials say chances of finding more survivors are 'very small'

http://www.dailymail.co.uk/news/article-2092029/Rio-Janeiro-explosion-21-feared-dead-2-multi-storey-buildings-collapse.html