According to the Rio city hall, 2.1 million people attended the pop icon's concert.Start the day smarter. Get all the news you need in your inbox each morning. "The suspects were recruiting participants,

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.