The takeover attempt of U.S-based telecommunications and semiconductor manufacturer Qualcomm by rival Singapore-based Broadcom has caught the eye of U.S. regulators.

The Committee on Foreign Investment in the United States (CFIUS), an interagency group chaired by the U.S. treasury secretary that reviews foreign investments in U.S. companies, ruled that the move by Broadcom posed a threat to U.S. security interests, effectively halting the acquisition for the foreseeable future.