WASHINGTON (AP) – American companies should avoid sourcing network equipment from China’s two leading technology firms because they pose a national security threat to the United States, the House Intelligence Committee warned Monday.

The panel said in a report that U.S. regulators should block mergers and acquisitions in this country by Huawei Technologies Ltd. and ZTE Corp, among the world’s leading suppliers of telecommunications gear and mobile phones.

Reflecting U.S. concern over cyber-attacks traced to China, the report also recommends that U.S. government computer systems not include any components from the two firms because that could pose an espionage risk.