Jorge Santiago Aguirre is a lawyer at the Centro de Derechos Humanos Miguel Agustin Pro Juarez, a major human rights group in Mexico City, so he was curious when he got this text message in April 2016:
"Mr. Jorge this is Juan Magarino," it read in Spanish. "Please help with my brother Heriberto a teacher who has been kidnapped by police it's a crime."
Then, there was a hyperlink.
He says the text didn't feel like random spamming.
"It was related to information that was personal to us," he says.