Private equity firm Carlyle Group Inc. is in advanced talks to acquire ManTech International Corp., a government contractor that also does IT services, according to people familiar with the matter.

A deal could be announced as soon as this week, said the people, who asked not to be identified because the information is private. The transaction values ManTech at about $4 billion, the people said. 

ManTech shares closed on Friday at $81.97 apiece, giving the company a market value of $3.35 billion. 

Read more: BNN Bloomberg