Summary Box: China responds to US tech probe

THE PROBE: A congressional committee says it will investigate whether allowing Chinese companies to expand in the United States might aid Chinese electronic spying.

THE RESPONSE: China says the U.S. should avoid politicizing investment. A foreign ministry official says Chinese companies obey the law and act according to market principles.

THE DETAILS: The House panel plans to look into the role that Chinese companies play in supplying components for U.S. telecoms systems and whether access to those systems might allow foreign governments to gather information. It cites Huawei Technologies Ltd. and rival ZTE Corp., makers of telecommunications gear.