Bloomberg reports that Samsung is suing the iPhone creator in the U.S. a week after making claims in Asia and Europe.

Apple is infringing 10 patents related to mobile phones, Samsung said in an April 27 lawsuit in federal court in San Jose, California. The Suwon, South Korea-based company, which sells the Galaxy smartphone and tablet, claims Apple is using Samsung’s inventions without paying.

The lawsuit intensifies a legal dispute that began when Cupertino, California-based Apple sued Samsung earlier this month, claiming the Galaxy products “slavishly” copied iPad and iPhone technology and design. Samsung, which is also a supplier of some Apple chips, retaliated last week with lawsuits in Seoul, Tokyo and Mannheim, Germany.

  Samsung Broadens Patent Dispute Against Apple With U.S. Suit