Google is purchasing Mandiant for $5.4 billion

Google (GOOG) on Tuesday announced it has agreed to buy cybersecurity firm Mandiant for around $5.4 billion, one of the largest acquisitions in the tech giant's history.

"The acquisition of Mandiant will complement Google Cloud's existing strengths in security," Google and Mandiant said in a joint statement Tuesday. "Combined with Google Cloud's cloud-native security offerings, the acquisition will help enterprises globally stay protected at every stage of the security lifecycle."

Mandiant launched in 2004 and was bought by FireEye in 2013. It was spun out as an independent company after FireEye sold its product business last year for $1.2 billion US.