The suspects -- one adult male detained in Rio Grande do Sul and a teenager arrested in Rio de Janeiro -- are both reported fans of Lady Gaga and were allegedly planning to use improvised explosives, including Molotov cocktails, authorities said. No explosives were found during the operation, according to police.

Brazilian police announced the arrest of two people who allegedly planned to target Lady Gaga's free concert in Rio de Janeiro. The "Mayhem" singer performed to a crowd of two million.