Massive overbilling for Rio's Maracana stadium rebuild

General view of the Maracana pitch taken during 2014 FIFA World Cup

The major refurbishment of Rio's famous Maracana football stadium ahead of the 2014 World Cup was marred by millions of dollars in overbilling, a government watchdog says.

The renovation of the stadium cost about $500 million, more than double the original bid.

According to the Rio de Janeiro auditing court, part of the reason for this was overbilling by the contractors to the tune of 211 million reais (about $90 million at 2014 rates).

The accusations were first aired late Sunday by Globo television and the documents were seen by AFP on Monday.

One example of overbilling was cement bought at three times the market price. Another was the new roof, which cost five times as much as a similar roof on the Soccer City stadiums built in Johannesburg for the 2010 World Cup, Globo reported.

Some services, such as hiring of cranes, were simply billed twice.

Rio prosecutors on Friday demanded that contractors Odebrecht and Andrade Gutierrez -- two huge companies involved in a major corruption scandal at state oil company Petrobras -- and Delta Engenharia repay some 200 million reais.

Odebrecht told AFP that the company "reaffirms its commitment to collaborate with the authorities."