NEW YORK (AP) — The fight between Monster Beverage and San Francisco's city attorney is intensifying. The city attorney is filing a lawsuit accusing the energy drink maker of marketing to young children.

City Attorney Dennis Herrera said Monday that Monster markets it highly caffeinated drinks to children as young as 6 years old, despite scientific findings that such products can cause health problems including severe cardiac events.

The lawsuit comes after Monster last week sued Herrera over his demands that it reduce the caffeine levels in its drinks and stop marketing to minors

On Monday, Herrera noted that his office had been working with Monster in "good faith to negotiate voluntary changes" when the company abruptly filed its lawsuit.

A spokesman for Monster Beverage Corp. did not immediately have a comment.

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