"We have sophisticated equipment to search people when they go in, but they avoided this by finding another way to bring in cellphones and drugs," prison director Luciano Gamateli told Globo TV.

Officials said the pigeons, bred and trained inside the prison, lived on the jail's roof, where prisoners would take their deliveries before smuggling the birds out again through friends and family.

The scheme was uncovered when guards on the prison walls saw some pigeons struggling to fly.

Brazil's overcrowded prisons have notoriously lax security, with cell-phone and drug use common among inmates. Two years ago, a powerful Sao Paulo prison gang used cell-phones to orchestrate a wave of attacks against police and public property.

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