NEW YORK (AP) - FireEye Inc. says it has acquired Mandiant Corp., which linked years of cyberattacks attacks against U.S. companies to a secret Chinese military unit.

NEW YORK (AP) FireEye Inc. says it has acquired Mandiant Corp., which linked years of cyberattacks attacks against U.S. companies to a secret Chinese military unit.

The computer-security company said Thursday that the purchase of privately held Mandiant would increase its ability to stop attacks in their early stages.

FireEye, which had a successful initial public offering of stock in September, said it would issue 21.5 million shares and options of its stock, which closed Thursday at $41.13, and pay $106.5 million in cash to former Mandiant security holders. That would value the deal at about $1 billion.