(AP) — San Francisco’s city attorney and New York’s attorney general are joining forces to investigate allegations that Monster Beverage is marketing its highly caffeinated drinks to children.

The recently revealed alliance was formed last month, around the same time a federal judge tossed out a lawsuit Monster filed seeking to stop San Francisco City Attorney Dennis Herrera’s investigation of the energy drink maker.

Herrera then filed a lawsuit accusing Corona, Calif.-based Monster Beverage Corp. of misbranding its energy drinks and marketing them to minors.

Meanwhile, New York Attorney General Eric Schneiderman has issued subpoenas to Monster and other energy-drink makers as part of his investigation.

The Food and Drug Administration has been investigating reports of five deaths allegedly linked to Monster beverages.

The company has repeatedly said its drinks are safe.