China's army may be behind a computer hacking group that hasattacked at least 141 companies worldwide since 2006, according toa report by a U.S. security firm.

The attacks, mainly directed at U.S. companies, were carried outby a group that is “likely government sponsored” and is similar “inits mission, capabilities, and resources” to a unit of the People'sLiberation Army, Mandiant Corp. said in a report today.

Mandiant said it traced the group, labeled Advanced PersistentThreat 1, to four large computer networks in Shanghai. Two of thenetworks serve the Pudong New Area district, where a secret armyunit called 61398 is based, the report said.

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