FIVE severed human heads were thrown onto a dance floor in a crowded disco in western Mexico, officials said. Authorities blamed the grisly scene on rival drug gangs. “Hooded men dressed in black stormed into a bar, fired into the air and threw down five heads,” said Rosaura Trujillo, a spokeswoman for the Michoacan state prosecutor's office. The men also left a card with the message: “The family does not kill for money. It does not kill women. It does not kill innocents. It kills only those who deserve to die. Everyone take note - this is divine justice.” According...